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Railway Engineering Notes for IES and SSC JE

Railway Engineering

It is the branch of civil engineering which deals with the construction and maintenance of railway track for the safe and efficient movement of trains on it. Railway tracks are broadly divided into two parts.

1- Temporary-

These tracks are provided for the transportation of earth and construction materials.

2- Permanent-

These tracks are provided for the movement of passanger trains and goods trains.

Gauge distance-

It is the distance between inner faces of rails or running faces of rails.

BG- 1.676 m

SG- 1.435 m

MG- 1.000 m

NG- 0.762 m

FG- 0.610 m


Rail sections convert rolling loads into point load. Rail section should be made up of cast iron or high carbon steel.

Rail section can be considered as continuous steel beam member.

Buckling of rails-

Due to increase in temperature if there is not sufficient amount of space is available between rail joints, buckling of rails will happen and it will cause derailment. Rail joint are necessary to hold together rails in correct position and also provide required expansion space between rails.

4 fish bolts are provided to connect two fish plates. Fish bolts and fish plates are made up of cast iron or high carbon steel.


Sleepers are provided to generate elasticity on the railway track. Sleepers must be continuous below the rail sections ( To avoide differential settlement ). Sleepers are placed transverse to the rails.

Sleepers convert point load from rails to ballast as u.d.l or line load.


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