Cross Section of Permanent Way.pdf
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About This Presentation
Cross Section of Permanent Way – Functions and types of Rails, Sleepers and Ballast, Gauge
Slide Content
Cross Section of Permanent Way
By
Dr.T. Vijaya Gowri,
Associate Professor,
Department of Civil Engineering
B. V. Raju Institute of Civil Engineering
By
Dr.T. Vijaya Gowri,
Associate Professor,
Department of Civil Engineering
B. V. Raju Institute of Civil Engineering
Permanent Way
The railway track of permanent natureis called permanent wayor
permanent track.
In other words,a permanent way is the combination of rails, fitted on
sleepers and resting on ballast and subgrade.
The railway track of permanent natureis called permanent wayor
permanent track.
In other words,a permanent way is the combination of rails, fitted on
sleepers and resting on ballast and subgrade.
Purpose ofPermanent Way
The purpose of the permanent wayis
to provide a permanent facility for safe and quick movements of normal
commercial traffic between the starting and destination station.
The purpose of the permanent wayis
to provide a permanent facility for safe and quick movements of normal
commercial traffic between the starting and destination station.
Component Parts of a Permanent Way
The following are the component
parts of a permanent way:
a) Formation of sub-grade.
b) Ballast.
c) Sleepers.
d) Rail.
e) Fixtures and fastenings.
The following are the component
parts of a permanent way:
a) Formation of sub-grade.
b) Ballast.
c) Sleepers.
d) Rail.
e) Fixtures and fastenings.
Requirements of
an Ideal Permanent Way
The following are the principal requirements of an ideal permanent way:
1.The gauge should be correct and uniform.
2.The rail should be at a proper level. In the straight track, two rails must
be at the same level. On curves, the outer rail should have proper
superelevation.
3.The alignment should be correct.
4.The gradient should be uniform. Any change of gradient should be
followed by a smooth vertical curve.
5.The tractive resistance of the track should be minimum.
an Ideal Permanent Way
The following are the principal requirements of an ideal permanent way:
1.The gauge should be correct and uniform.
2.The rail should be at a proper level. In the straight track, two rails must
be at the same level. On curves, the outer rail should have proper
superelevation.
3.The alignment should be correct.
4.The gradient should be uniform. Any change of gradient should be
followed by a smooth vertical curve.
5.The tractive resistance of the track should be minimum.
Requirements of
an Ideal Permanent Way
6.The track should possess sufficient elasticity.
7.The track should be sufficiently strong against lateral
forces.
8.The radius and superelevation on curves should be
properly designed and maintained.
9.The drainage system of the track should be perfect.
10.It should be free from excessive rail joints. All joints
including points and crossing should be properly
designed and maintained.
an Ideal Permanent Way
6.The track should possess sufficient elasticity.
7.The track should be sufficiently strong against lateral
forces.
8.The radius and superelevation on curves should be
properly designed and maintained.
9.The drainage system of the track should be perfect.
10.It should be free from excessive rail joints. All joints
including points and crossing should be properly
designed and maintained.
Requirements of
an Ideal Permanent Way
11.All the components of track should fully satisfy the requirements for
which they have been provided.
12.There should be adequate provision for easy renewals and repairs of any
portion of the track.
13.The track structure should be strong.
14.The initial cost of construction, as well as the maintenance cost of the
track, should be as minimum as possible.
an Ideal Permanent Way
11.All the components of track should fully satisfy the requirements for
which they have been provided.
12.There should be adequate provision for easy renewals and repairs of any
portion of the track.
13.The track structure should be strong.
14.The initial cost of construction, as well as the maintenance cost of the
track, should be as minimum as possible.
Rails
The rolled steel sections laid end to
end in two parallel lines over sleepers
to form a railway track as known
asrails.
The rolled steel sections laid end to
end in two parallel lines over sleepers
to form a railway track as known
asrails.
Functions of Rails
Rails in the railway track serve the following functions:
1)Rails provide ahard,smooth surfacefor passage of heavy moving loads with
minimum tractive resistance.
2)Rails bear the stresses developed due to heavy vertical loads, lateral and braking
forces and variation in temperature.
3)Rails provide acontinuous level surfaceand as possible as astraightpathfor the
movement of trains, which helps the traffic to travel comfortably.
4)Rails transmit the loads to sleepers and consequently reduce pressure on ballast
and formation.
5)They assist as alateral guidefor the wheels of a train.
6)Therail material(high carbon steel) used is such that it can easily withstandwear
and tear.
Rails in the railway track serve the following functions:
1)Rails provide ahard,smooth surfacefor passage of heavy moving loads with
minimum tractive resistance.
2)Rails bear the stresses developed due to heavy vertical loads, lateral and braking
forces and variation in temperature.
3)Rails provide acontinuous level surfaceand as possible as astraightpathfor the
movement of trains, which helps the traffic to travel comfortably.
4)Rails transmit the loads to sleepers and consequently reduce pressure on ballast
and formation.
5)They assist as alateral guidefor the wheels of a train.
6)Therail material(high carbon steel) used is such that it can easily withstandwear
and tear.
Types of Rails
In railway engineering, there are 3types of railsare used in the construction of
railway track which is discussed below:
1.Double Headed Rails.
2.Bull Headed Rails.
3.Flat Footed Rails.
In railway engineering, there are 3types of railsare used in the construction of
railway track which is discussed below:
1.Double Headed Rails.
2.Bull Headed Rails.
3.Flat Footed Rails.
Double Headed Rails
The rail sections, having their head and foot of
same dimensions, are known as double headed
or Dumb-bell rails.
These rails have less strength and stiffness as
compared to flat footed rails.
These rails are not used nowadays on Indian
Railway.
The rail sections, having their head and foot of
same dimensions, are known as double headed
or Dumb-bell rails.
These rails have less strength and stiffness as
compared to flat footed rails.
These rails are not used nowadays on Indian
Railway.
Bull Headed Rails
The rail section, having their head little
thicker and stronger(Bull size) than the
lower part is known as Bull headed rails.
These rails have less strength stiffness as
compared to flat footed rails.
Bull headed rails are generally used for
constructing points and crossings.
The rail section, having their head little
thicker and stronger(Bull size) than the
lower part is known as Bull headed rails.
These rails have less strength stiffness as
compared to flat footed rails.
Bull headed rails are generally used for
constructing points and crossings.
Bull Headed Rail
ADVANTAGES
1. They keep better alignment and give a
more solid and smoother track.
2. The rails can be easily removed and
replacedquickly. Hence renewal of track is
easy.
3. The heavy chair with a large bearing on
sleepers gives longer life to the wooden
sleepers and greater stability to the track.
4. These rails facilitate easy manufacturing
of points and crossings.
DISADVANTAGES
1. They require costlyfastenings.
2. They have less strength and
stiffness.
3. They require heavy
maintenance cost.
ADVANTAGES
1. They keep better alignment and give a
more solid and smoother track.
2. The rails can be easily removed and
replacedquickly. Hence renewal of track is
easy.
3. The heavy chair with a large bearing on
sleepers gives longer life to the wooden
sleepers and greater stability to the track.
4. These rails facilitate easy manufacturing
of points and crossings.
DISADVANTAGES
1. They require costlyfastenings.
2. They have less strength and
stiffness.
3. They require heavy
maintenance cost.
Flat Footed Rails(F.F. Rails)
The rail sections, having a flat foot, are
known as flat-footed rails.
These rails have morestrength and
stiffness as compared to Double
Headed Rails & Bull Headed Rails.
Flat footed rails are most commonly
used in India.
The rail sections, having a flat foot, are
known as flat-footed rails.
These rails have morestrength and
stiffness as compared to Double
Headed Rails & Bull Headed Rails.
Flat footed rails are most commonly
used in India.
Flat Footed Rails(F.F. Rails)
ADVANTAGES
1. These rails have more strength and
stiffness.
2. Fitting of rails with sleepers is simplerso they
can be easily laid and re-laid.
3. No chairs and keys are required as in case B.H
rails.
4. Maintenance of points and crossings made with
these rails is easy.
5. They give better stability and longer life to the track
and reducesmaintenance cost.
6. These rails are less costly than other types of rails.
7. These rails require less number of fastenings.
DISADVANTAGES
1. The fitting get loosened more
frequently.
2. The straightening of bent rails, replacing
of railsand de-hoggingof battered rails
are difficult.
3. These rails sinkinto the wooden
sleepers under heavy trainload. Hence
they require a bearing plateto overcome
this problem.
4. Manufacturingof points and crossing
with these rails is difficult.
ADVANTAGES
1. These rails have more strength and
stiffness.
2. Fitting of rails with sleepers is simplerso they
can be easily laid and re-laid.
3. No chairs and keys are required as in case B.H
rails.
4. Maintenance of points and crossings made with
these rails is easy.
5. They give better stability and longer life to the track
and reducesmaintenance cost.
6. These rails are less costly than other types of rails.
7. These rails require less number of fastenings.
DISADVANTAGES
1. The fitting get loosened more
frequently.
2. The straightening of bent rails, replacing
of railsand de-hoggingof battered rails
are difficult.
3. These rails sinkinto the wooden
sleepers under heavy trainload. Hence
they require a bearing plateto overcome
this problem.
4. Manufacturingof points and crossing
with these rails is difficult.
Railway Sleepers
DEFINITION
Railway sleepers are the components on
which the rails are arranged with proper
gauge.
These sleepers generally rests on ballast
and is also called as tiesin some regions.
The load from rails when train passes, is
taken by these sleepers and is
distributedit to the ballast.
FUNCTIONS
1. To hold the rails strongly and to
maintainuniform gauge.
2. To transferthe loads from rails to
ballast or ground.
3. To reduce vibrations from the rail.
4. To offerlongitudinal and lateral
stability.
DEFINITION
Railway sleepers are the components on
which the rails are arranged with proper
gauge.
These sleepers generally rests on ballast
and is also called as tiesin some regions.
The load from rails when train passes, is
taken by these sleepers and is
distributedit to the ballast.
FUNCTIONS
1. To hold the rails strongly and to
maintainuniform gauge.
2. To transferthe loads from rails to
ballast or ground.
3. To reduce vibrations from the rail.
4. To offerlongitudinal and lateral
stability.
Types of Railway Sleepers
Based on the materials used, railway sleepers are classified into following types.
1.Wooden sleepers
2.Concrete sleepers
3.Steel sleepers
4.Cast iron sleepers
5.Composite sleepers
Based on the materials used, railway sleepers are classified into following types.
1.Wooden sleepers
2.Concrete sleepers
3.Steel sleepers
4.Cast iron sleepers
5.Composite sleepers
Wooden Sleepers
These are sleepers made of wood.
Wooden sleepers are used since olden
days.
These are still widely using in some
western countries.
Either hardwood or softwood can be
used to make wooden sleepers.
However, hardwood sleepers made of
oak, jarrah, teakwood are more famous.
These are sleepers made of wood.
Wooden sleepers are used since olden
days.
These are still widely using in some
western countries.
Either hardwood or softwood can be
used to make wooden sleepers.
However, hardwood sleepers made of
oak, jarrah, teakwood are more famous.
Wooden Sleepers
ADVANTAGES
•Wood sleepers are cheaperthan others and
easy to manufacture.
•They are light in weight so, they can be
easily transported and handled while
installing.
•Fastenerscan be easily installed to wooden
sleepers. They are good insulators so, rails
are well protected.
•Any type of gauge can be maintained by
wooden sleepers.
•They are suitable for all types of rail section.
•They are well suitable for tracks in coastal
areas.
DISADVANTAGES
•Life of wooden sleepers is very less
compared to others.
•Weakagainst fire.
•Easily affected by humidity which
will cause dry rot, wet rot etc.
•Vermin attack can be possible if it is
not properly treated.
•Poor creep resistance.
•Good Attention is required even
after laying.
ADVANTAGES
•Wood sleepers are cheaperthan others and
easy to manufacture.
•They are light in weight so, they can be
easily transported and handled while
installing.
•Fastenerscan be easily installed to wooden
sleepers. They are good insulators so, rails
are well protected.
•Any type of gauge can be maintained by
wooden sleepers.
•They are suitable for all types of rail section.
•They are well suitable for tracks in coastal
areas.
DISADVANTAGES
•Life of wooden sleepers is very less
compared to others.
•Weakagainst fire.
•Easily affected by humidity which
will cause dry rot, wet rot etc.
•Vermin attack can be possible if it is
not properly treated.
•Poor creep resistance.
•Good Attention is required even
after laying.
Concrete Sleepers
Concrete sleepers are manufactured by
concrete with internal reinforcement.
Concrete sleepers used in many countries due
to its high stability and small maintenance.
These are more suitable for high speed rails.
Most of the concrete sleepers are made from
pre-stressed concrete in which internal tension
is induced into the sleeper before casting.
Hence, the sleeper withstand well against high
external pressure.
Concrete sleepers are manufactured by
concrete with internal reinforcement.
Concrete sleepers used in many countries due
to its high stability and small maintenance.
These are more suitable for high speed rails.
Most of the concrete sleepers are made from
pre-stressed concrete in which internal tension
is induced into the sleeper before casting.
Hence, the sleeper withstand well against high
external pressure.
Concrete Sleepers
ADVANTAGES
•Concrete sleepers are heavierthan all other types
hence, gives good stability to the rails.
•They have long life span so, economicallypreferable.
•They have goodFire resistance.
•Corrosionis not occurred in concrete sleepers.
•Vermin attack, decay etc. are not occurred. Hence, they
are suitable for all types of soil and moisture conditions.
•Bucking strength is more.
•Concrete is good insulator so, this type of sleepers are
more suitable for circuited tracks.
•Concrete sleepers holdsthe track strongly and
maintainsgauge.
DISADVANTAGES
•Because of heavy weight,
handlingis difficult.
•For tracks on bridges and
at crossings, concrete
sleepers are not suitable.
•Damage may occur while
transporting.
ADVANTAGES
•Concrete sleepers are heavierthan all other types
hence, gives good stability to the rails.
•They have long life span so, economicallypreferable.
•They have goodFire resistance.
•Corrosionis not occurred in concrete sleepers.
•Vermin attack, decay etc. are not occurred. Hence, they
are suitable for all types of soil and moisture conditions.
•Bucking strength is more.
•Concrete is good insulator so, this type of sleepers are
more suitable for circuited tracks.
•Concrete sleepers holdsthe track strongly and
maintainsgauge.
DISADVANTAGES
•Because of heavy weight,
handlingis difficult.
•For tracks on bridges and
at crossings, concrete
sleepers are not suitable.
•Damage may occur while
transporting.
Steel Sleepers
Steel sleepers are more often used
because of stronger than wood and
economical than concrete.
They also have goodlife span.
They are molded in troughshape and
placed on ballast in inversed trough
shape.
Steel sleepers are more often used
because of stronger than wood and
economical than concrete.
They also have goodlife span.
They are molded in troughshape and
placed on ballast in inversed trough
shape.
Steel Sleepers
ADVANTAGES
•They are light in weight so, easy to transport, to place
and to install.
•They are recyclable hence possess good scrap value.
•Life span of steel sleepers is more and is about 30
years.
•They are good resistant against fire.
•They have good resistance against creep
•They cannot be attacked by vermin etc.
•They are well suitable for tracks of high speeds and
larger loads.
•They holds the rail stronglyand connecting rail to the
sleeperis also simple.
DISADVANTAGES
•Steel can be effected by chemicals
easily.
•Steel sleepers requires high
maintenance.
•They are not suitable for all types of
ballast which is provided as bed for
sleepers.
•If derailmentis happened, they
damaged very badly and not suitable
for re using.
•These are not suitable for all types of
rail sections and gauges.
ADVANTAGES
•They are light in weight so, easy to transport, to place
and to install.
•They are recyclable hence possess good scrap value.
•Life span of steel sleepers is more and is about 30
years.
•They are good resistant against fire.
•They have good resistance against creep
•They cannot be attacked by vermin etc.
•They are well suitable for tracks of high speeds and
larger loads.
•They holds the rail stronglyand connecting rail to the
sleeperis also simple.
DISADVANTAGES
•Steel can be effected by chemicals
easily.
•Steel sleepers requires high
maintenance.
•They are not suitable for all types of
ballast which is provided as bed for
sleepers.
•If derailmentis happened, they
damaged very badly and not suitable
for re using.
•These are not suitable for all types of
rail sections and gauges.
Cast Iron Sleepers
Cast iron sleepers are widely used in the world
especially in Indian railways.
They are available in 2 types, pot type sleepers
and plate type sleepers.
Pot type sleepers are not suitable for curves
sharper than 4 degrees.
CST 9 type sleepers more famousin Indian
railways.
plate type CST 9 type
pot type
Cast iron sleepers are widely used in the world
especially in Indian railways.
They are available in 2 types, pot type sleepers
and plate type sleepers.
Pot type sleepers are not suitable for curves
sharper than 4 degrees.
CST 9 type sleepers more famousin Indian
railways.
plate type CST 9 type
pot type
Cast Iron Sleepers
ADVANTAGES
•Cast Iron sleepers can be used for longer
period up to 60 years.
•Their manufacturing is also easy and it
can be done locally so, there is no need
for longer transportation.
•Vermin attack is impossiblein case of cast
iron sleepers.
•They provide strong seat to the rail.
•Damaged cast iron sleepers can be
remoldedinto new sleepers hence, scrap
value of cast iron is good.
•Creep of rail can be prevented by cast
iron sleepers
DISADVANTAGES
•Cast iron is brittle in nature and it can be
damaged easily while handling. So,
transportation, placing is difficultto deal.
•Cast iron sleepers can be easily damaged
and corrodedby salt water so, they are
not suitable for coastal regions.
•They may damage badly when derailment
happened.
•Cast iron is expensivein market when
compared to some other sleeper
materials. Hence it is uneconomical.
•So many fastening materials are required
to fix the rail to the sleeper.
•Proper Maintenanceis required.
ADVANTAGES
•Cast Iron sleepers can be used for longer
period up to 60 years.
•Their manufacturing is also easy and it
can be done locally so, there is no need
for longer transportation.
•Vermin attack is impossiblein case of cast
iron sleepers.
•They provide strong seat to the rail.
•Damaged cast iron sleepers can be
remoldedinto new sleepers hence, scrap
value of cast iron is good.
•Creep of rail can be prevented by cast
iron sleepers
DISADVANTAGES
•Cast iron is brittle in nature and it can be
damaged easily while handling. So,
transportation, placing is difficultto deal.
•Cast iron sleepers can be easily damaged
and corrodedby salt water so, they are
not suitable for coastal regions.
•They may damage badly when derailment
happened.
•Cast iron is expensivein market when
compared to some other sleeper
materials. Hence it is uneconomical.
•So many fastening materials are required
to fix the rail to the sleeper.
•Proper Maintenanceis required.
Composite Sleepers
Composite sleepers are modern type
sleepers which are made from waste
plastic and rubber.
Hence, it is also called as plastic
sleepers.
They have many combined properties
of all other types.
Composite sleepers are modern type
sleepers which are made from waste
plastic and rubber.
Hence, it is also called as plastic
sleepers.
They have many combined properties
of all other types.
Composite Sleepers
ADVANTAGES
•Composite sleepers are serviceable for longer
spans about 50 years.
•Composite sleepers are eco-friendly sleepers.
•They are light in weight but possess great
strength.
•Their scrap value is good because of recyclable
property of composite sleepers.
•They can be resizedeasily like wooden sleepers.
So, they can be used for any type of rail section.
•Vibrations received from rails are reduced well
by these composite sleepers.
DISADVANTAGES
•Composite sleepers are not that
much good against fire.
•The cost of sleepers may increase for
large scale production.
ADVANTAGES
•Composite sleepers are serviceable for longer
spans about 50 years.
•Composite sleepers are eco-friendly sleepers.
•They are light in weight but possess great
strength.
•Their scrap value is good because of recyclable
property of composite sleepers.
•They can be resizedeasily like wooden sleepers.
So, they can be used for any type of rail section.
•Vibrations received from rails are reduced well
by these composite sleepers.
DISADVANTAGES
•Composite sleepers are not that
much good against fire.
•The cost of sleepers may increase for
large scale production.
BALLAST
DEFINITION
Ballastis the granular material
usually broken stone or any other
suitable material which is spread on
the top of railway formation and
around the sleepers.
FUNCTIONS
(i) To hold the sleepers in position and
preventing the lateral and longitudinal
movement.
(ii) To distribute the axle load uniform from
sleepers to a large area of formation.
(iii) To provide elasticityto the track. It acts as
aselastic mat between subgrade and sleepers.
(iv) To provide easy means of maintaining the
correct levels of the two rails in a track.
(v) To drain rain water from the track.
(vi) To prevent the growth of weeds inside the
track.
DEFINITION
Ballastis the granular material
usually broken stone or any other
suitable material which is spread on
the top of railway formation and
around the sleepers.
FUNCTIONS
(i) To hold the sleepers in position and
preventing the lateral and longitudinal
movement.
(ii) To distribute the axle load uniform from
sleepers to a large area of formation.
(iii) To provide elasticityto the track. It acts as
aselastic mat between subgrade and sleepers.
(iv) To provide easy means of maintaining the
correct levels of the two rails in a track.
(v) To drain rain water from the track.
(vi) To prevent the growth of weeds inside the
track.
CHARACTERISTICS OF GOOD BALLAST
(i) It should have sufficient strength to resist crushing under heavy loads of moving
trains.
(ii) It should be durable enough to resist abrasion and weathering action.
(iii) It should have rough and angular surface so as to provide good lateral and
longitudinal stability to the sleepers.
(iv) It should have good workability so that it can be easily spread of formation.
(v) It should be cheaply available in sufficient quantity near and along the track.
(vi) It should not make the track dusty or muddy due to its crushing to powder under
wheel loads.
(vii) It should allow for easy and quick drainage of the track.
(viii) It should not have any chemical actionon metal sleepers and rails.
(i) It should have sufficient strength to resist crushing under heavy loads of moving
trains.
(ii) It should be durable enough to resist abrasion and weathering action.
(iii) It should have rough and angular surface so as to provide good lateral and
longitudinal stability to the sleepers.
(iv) It should have good workability so that it can be easily spread of formation.
(v) It should be cheaply available in sufficient quantity near and along the track.
(vi) It should not make the track dusty or muddy due to its crushing to powder under
wheel loads.
(vii) It should allow for easy and quick drainage of the track.
(viii) It should not have any chemical actionon metal sleepers and rails.
TYPES OF BALLAST
In India, the following materials are used as ballast.
(i) Broken stone.
(ii) Gravel
(iii) Sand
(iv) Ashes or cinders
(v) Kankar
(vi) Moorum
(vii) Blast furnace slag
(viii) Brick ballast
(ix) Selected earth
In India, the following materials are used as ballast.
(i) Broken stone.
(ii) Gravel
(iii) Sand
(iv) Ashes or cinders
(v) Kankar
(vi) Moorum
(vii) Blast furnace slag
(viii) Brick ballast
(ix) Selected earth
BROKEN STONE
This is the best type of ballast as it possesses all the
characteristics of a good ballast.
It holds the track to correct alignment and gradient due
to its high interlocking action.
The stones which are non porous, hard and do not flake
on breaking should be used.
Igneous rocks such as granite, quartzite and trap make
excellent ballast.
This type of ballast is used for high speed tracks.
This is the best type of ballast as it possesses all the
characteristics of a good ballast.
It holds the track to correct alignment and gradient due
to its high interlocking action.
The stones which are non porous, hard and do not flake
on breaking should be used.
Igneous rocks such as granite, quartzite and trap make
excellent ballast.
This type of ballast is used for high speed tracks.
BROKEN STONE
ADVANTAGES
a. It is hard and resist crushing
under heavy loads.
b. It has angular and rough surface
and hence gives more stability to
the sleepers.
c. Its drainage property is excellent.
DISADVANTAGES
(a) It is expensive.
(b) It is not so easily available.
ADVANTAGES
a. It is hard and resist crushing
under heavy loads.
b. It has angular and rough surface
and hence gives more stability to
the sleepers.
c. Its drainage property is excellent.
DISADVANTAGES
(a) It is expensive.
(b) It is not so easily available.
GRAVEL
Gravel is the second best material for ballast. This is
obtained either from river beds or from gravel pits and
has smooth rounded fragments.
Gravel obtained from pitsusually contains earth which
should be removed by washing.
Gravel obtained from river beds is screened and
required size gravel is used.
Larger size gravels are brokeninto required size.
Round edges gravels are brokento increase their
interlocking action.
Gravel is the second best material for ballast. This is
obtained either from river beds or from gravel pits and
has smooth rounded fragments.
Gravel obtained from pitsusually contains earth which
should be removed by washing.
Gravel obtained from river beds is screened and
required size gravel is used.
Larger size gravels are brokeninto required size.
Round edges gravels are brokento increase their
interlocking action.
GRAVEL
ADVANTAGES
(a) Gravel is cheaper than stone
ballast.
(b) The drainage property of gravel
excellent.
(c) It holds the track to correct
alignmentand gradient.
(d) It is ease to use gravel ballast
than stone ballast at certain places
where formation is unstable
DISADVANTAGES
(a) It requires screeningbefore use
due to large variation in size.
(b) Gravel obtained from pits
requires washing.
(c) Due to round faces the packing
under sleepers is loose.
(d) Gravel easily roll down due to
vibrations.
ADVANTAGES
(a) Gravel is cheaper than stone
ballast.
(b) The drainage property of gravel
excellent.
(c) It holds the track to correct
alignmentand gradient.
(d) It is ease to use gravel ballast
than stone ballast at certain places
where formation is unstable
DISADVANTAGES
(a) It requires screeningbefore use
due to large variation in size.
(b) Gravel obtained from pits
requires washing.
(c) Due to round faces the packing
under sleepers is loose.
(d) Gravel easily roll down due to
vibrations.
SAND
Sand is reasonably a good material for the
ballast.
Coarse sand is generally preferred to fine sand
for ballast.
This type of ballast is suitable for packing pot
sleepers.
It is used only on unimportant tracks.
Sand is reasonably a good material for the
ballast.
Coarse sand is generally preferred to fine sand
for ballast.
This type of ballast is suitable for packing pot
sleepers.
It is used only on unimportant tracks.
SAND
ADVANTAGES
(a) It is a cheapmaterial.
(b) It is available in large quantities.
(c) It has good drainage properties.
(d) Sand ballast produces a silent
track.
DISADVANTAGES
(a) It has no stability and gets
disturbed by the vibrations caused
by moving train.
(b) It causes wear of rail, seats and
keys.
ADVANTAGES
(a) It is a cheapmaterial.
(b) It is available in large quantities.
(c) It has good drainage properties.
(d) Sand ballast produces a silent
track.
DISADVANTAGES
(a) It has no stability and gets
disturbed by the vibrations caused
by moving train.
(b) It causes wear of rail, seats and
keys.
ASHES OR CINDERS
ADVANTAGES
These are waste products obtained
from steam locomotives.
(a) It is a cheaper ballast material.
(b) It has very good drainage quality.
(c) It is available in large quantities and
hence can be used in emergency.
(d) The handling and transportation
are easy.
DISADVANTAGES
(a) It is very soft and gets crumbled to
powder under heavy loads.
(b) It has got corrosive quality and
corrode steel sleepers and foot of the
rails.
ADVANTAGES
These are waste products obtained
from steam locomotives.
(a) It is a cheaper ballast material.
(b) It has very good drainage quality.
(c) It is available in large quantities and
hence can be used in emergency.
(d) The handling and transportation
are easy.
DISADVANTAGES
(a) It is very soft and gets crumbled to
powder under heavy loads.
(b) It has got corrosive quality and
corrode steel sleepers and foot of the
rails.
KANKAR
ADVANTAGES
It is natural material in the form of
nodules from which lime is
prepared.
(a) It is cheaper.
(b) It has good drainage property.
DISADVANTAGES
(a) It is soft and crumblesto powder
under traffic load.
(b) The track laid on kankarballast
are difficult to maintain.
(c) It has corrosivequality.
ADVANTAGES
It is natural material in the form of
nodules from which lime is
prepared.
(a) It is cheaper.
(b) It has good drainage property.
DISADVANTAGES
(a) It is soft and crumblesto powder
under traffic load.
(b) The track laid on kankarballast
are difficult to maintain.
(c) It has corrosivequality.
MOORUM
ADVANTAGES
It is a soft aggregate and is obtained
by the decomposition of laterite. It
has red or yellow colour.
It is used in unimportant lines and
sidings.
(a) It is easily available in most parts
of India.
(b) It has good drainage properties.
(c) It is used as blanket for new
embankment.
DISADVANTAGES
(a) It is soft and easily crumbles to
powder under heavy loads.
(b) Maintenance of track laid on
moorumballast is very difficult.
ADVANTAGES
It is a soft aggregate and is obtained
by the decomposition of laterite. It
has red or yellow colour.
It is used in unimportant lines and
sidings.
(a) It is easily available in most parts
of India.
(b) It has good drainage properties.
(c) It is used as blanket for new
embankment.
DISADVANTAGES
(a) It is soft and easily crumbles to
powder under heavy loads.
(b) Maintenance of track laid on
moorumballast is very difficult.
BLAST FURNANCE SLAG
ADVANTAGES
It is a waste product obtained from
the blast furnace of steel industry.
High grade slag fulfils all the
characteristics of good ballast.
(a) It is a cheap material.
(b) It has good drainage properties.
(c) It is a strong material.
(d) It holds the track in correct
alignment and gradient.
DISADVANTAGES
(a) It is not available in large
quantity.
(b) Spreadingof this material on the
formation is difficult.
(c) Maintenanceof track laid on slag
ballast is difficult.
ADVANTAGES
It is a waste product obtained from
the blast furnace of steel industry.
High grade slag fulfils all the
characteristics of good ballast.
(a) It is a cheap material.
(b) It has good drainage properties.
(c) It is a strong material.
(d) It holds the track in correct
alignment and gradient.
DISADVANTAGES
(a) It is not available in large
quantity.
(b) Spreadingof this material on the
formation is difficult.
(c) Maintenanceof track laid on slag
ballast is difficult.
BRICK BALLAST
ADVANTAGES
At places where good ballast
material is notavailable over-burnt
bricks are broken into suitable size
to be used as ballast.
(a) It is a cheapmaterial.
(b) It preventsgrowth of vegetation.
(c) It has good drainage properties.
DISADVANTAGES
(a) It is soft and easily crumbles to
powder under heavy loads.
(b) The rails laid over such ballast
get corrugated.
ADVANTAGES
At places where good ballast
material is notavailable over-burnt
bricks are broken into suitable size
to be used as ballast.
(a) It is a cheapmaterial.
(b) It preventsgrowth of vegetation.
(c) It has good drainage properties.
DISADVANTAGES
(a) It is soft and easily crumbles to
powder under heavy loads.
(b) The rails laid over such ballast
get corrugated.
SELECTED EARTH
Hardened clay and decomposed rockare
suitable for use as ballast.
When tracks are laid on new formation, then
sleepers are packedwith earth for a few
months.
When the formation is consolidatedand
surface becomes hard, good type of ballast is
laid.
The use of earth ballast in the beginning is to
prevent the loss of good ballast by sinking
into soft formation.
Hardened clay and decomposed rockare
suitable for use as ballast.
When tracks are laid on new formation, then
sleepers are packedwith earth for a few
months.
When the formation is consolidatedand
surface becomes hard, good type of ballast is
laid.
The use of earth ballast in the beginning is to
prevent the loss of good ballast by sinking
into soft formation.
Railway Gauge
The clear horizontal distance between
the inner faces of the two rails
forming a track is known as aRailway
Gauge.
The distance between the inner faces
of a pair of wheels is called thewheel
gauge.
The clear horizontal distance between
the inner faces of the two rails
forming a track is known as aRailway
Gauge.
The distance between the inner faces
of a pair of wheels is called thewheel
gauge.
Types of Gauges in India
In India the following gauges are used:
•a)Standard Gauge or Broad Gauge –Gauge width 1.676 m.
•b) Metre/Meter Gauge (M.G) –Gauge width 1.000 m.
•c) Narrow Gauge (N.G) –Gauge width 0.762 m.
•d) Feeder Track Gauge or Light Gauge –Gauge width 0.610 m.
In India the following gauges are used:
•a)Standard Gauge or Broad Gauge –Gauge width 1.676 m.
•b) Metre/Meter Gauge (M.G) –Gauge width 1.000 m.
•c) Narrow Gauge (N.G) –Gauge width 0.762 m.
•d) Feeder Track Gauge or Light Gauge –Gauge width 0.610 m.
Broad Gauge
When the clear distance between
the inner faces of the two rails is
1.676m, then the gauge is called
Broad Gauge.
This is also known asStandard
Gauge.
When the clear distance between
the inner faces of the two rails is
1.676m, then the gauge is called
Broad Gauge.
This is also known asStandard
Gauge.
Metre Gauge
If the horizontal distance between
the inner faces of two rails is 1.0 m,
the gauge is calledMeter Gauge.
If the horizontal distance between
the inner faces of two rails is 1.0 m,
the gauge is calledMeter Gauge.
Narrow Gauge
When the clear distance between the inner
faces of the two rails is 0.762m, the gauge is
called Narrow Gauge.
These gauges are mainly used for the hilly
area and the place where traffic volume is
low.
When the clear distance between the inner
faces of the two rails is 0.762m, the gauge is
called Narrow Gauge.
These gauges are mainly used for the hilly
area and the place where traffic volume is
low.
Factors Affecting Adopting
of a Particular Gauge
The following factors govern the choice of different gauges:
1.Cost of construction and funds available for the railway project.
2.Volume and nature of traffic.
3.The intensity of the population.
4.Industrial and commercial development of the locality.
5.Prospects of future development of the area.
6.Topographical and geological features of the country.
7.Speed of movement required.
of a Particular Gauge
The following factors govern the choice of different gauges:
1.Cost of construction and funds available for the railway project.
2.Volume and nature of traffic.
3.The intensity of the population.
4.Industrial and commercial development of the locality.
5.Prospects of future development of the area.
6.Topographical and geological features of the country.
7.Speed of movement required.
Advantages of Uniform Gauge
The use of a uniform gauge has the following advantages:
1. The delay cost and hardship in shifting passengers and goods from the vehicle of one gauge to the
other are avoided.
2. Labourexpenses of shifting are saved.
3.Breakage of goods due to shifting is avoided.
4.Possibility of thefts and misplacement during the shifting operation is eliminated.
5.Large sheds to store goods are not required.
6.Labourstrikes etc. do not affect the service and operation of trains.
7.Wagons can be efficiently used on all the tracks if the gauge is uniform.
8.Locomotives can be effectively used on all the tracks if a uniform gauge is adopted.
9.During military movement, no time is wasted in shifting of personnel and equipment’s if the gauge is
uniform.
10.Duplication of equipment such as platforms, sanitary arrangements, etcis avoided.
The use of a uniform gauge has the following advantages:
1. The delay cost and hardship in shifting passengers and goods from the vehicle of one gauge to the
other are avoided.
2. Labourexpenses of shifting are saved.
3.Breakage of goods due to shifting is avoided.
4.Possibility of thefts and misplacement during the shifting operation is eliminated.
5.Large sheds to store goods are not required.
6.Labourstrikes etc. do not affect the service and operation of trains.
7.Wagons can be efficiently used on all the tracks if the gauge is uniform.
8.Locomotives can be effectively used on all the tracks if a uniform gauge is adopted.
9.During military movement, no time is wasted in shifting of personnel and equipment’s if the gauge is
uniform.
10.Duplication of equipment such as platforms, sanitary arrangements, etcis avoided.
References
SatishChandraandAgarwal,M.M.(2007)"RailwayEngineering"OxfordHigherEducation,
UniversityPressNewDelhi.
SatishChandraandAgarwal,M.M.(2007)"RailwayEngineering"OxfordHigherEducation,
UniversityPressNewDelhi.
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