In this section all the P.O.H. work is done under
the frame Before lifting the coach frame from the
bogies the cotter pin is removed from the center pivot.
Main function of this shop is P.O.H. of the
following parts & operations done on them.
AIR BRAKES USE COMPRESSED AIR TO MAKE
THEM WORK. YOU CAN APPLY ALL THE
BRAKING FORCE YOU NEED TO EACH WHEEL
OF A VEHICLE, EVEN TRACTORS PULLING
TRAILERS. IF MAINTAINED AND USED PROPERLY
THEY WILL SAFELY STOP LARGE VEHICLES.
Bogie is very important part of the coach. It is to carry the motors ,
brake system and suspension system, all within a tight envelop.
The line diagram of a bogie is given below. The different parts of the
bogie are as follows :
PRIMARY SUSPENSION SPRINGS
SECONDARY SUSPENSION SPRINGS
ASSEMBLY OF ROLLER BEARING
In assembly section roller bearing is assembled on the
journal by using various processes. Introduction heating is done
for expanding inner race of the bearing of so that it can be
mounted on the journal of the wheel without any problem.
Induction heating includes following features :
1. Temperature is maintained at 120°C.
2. Minimum time for heating between induction coils is 5 to 7 min.
Smithing involves heating the metal or waste
material in an open hearth furnace and give it the
desired shape by forging. Optimal utilization of
waste metal can be made through this shop
Various sections of Smithy Shop are :
1. HAMMER SECTION
2. SPRING SECTION
3. HEAT TREATMENT & TENSILE TESTING
Heat treatment of different material is done to relieve
them from internal stresses developed during various cold
CLASSIFICATION OF STEEL BY INDIAL RAILWAY.
1. Class – 1 steel
2. Class – 2 steel
3. Class – 3 steel
Only three heat treatment operation are carried out in this section
Two types of coil springs are used for suspension :
Bolester Plate Spring
Axle Box Spring
Central Workshop Established
1ST Steam Loco Manufactured
POH of MG Diesel Loco Started
POH of first BG Wagon
POH of first BG Diesel Loco
Details Of Existing Infrastructure
otal area of W
Covered Area (Shed)
No. of machines
160000 Sq. Meters
In this shop periodic overhauling and
also some instant failure repair are carried
out for diesel engine.
The time lag between two overhauls may
vary from 3-5 years.
In the process of ‘periodic overhauling’, a
diesel engine is completely disassembled
and then the condemned parts are
completely replaced by new parts.
1. ENGINE BASE:
C.I. blocks are generally
used for their manufacturing.
The governor helps the engine in
following ways– At the time of low pressure of
lubrication oil, it stops the engine.
– It controls the main generator to
protect against overload and
– At the time of starting, lubrication
oil pressure of low, so it prevents
the engine from stopping upto 40
– It shuts downs the engine when
water level is low.
It has a no. of long
copper tubes arranged in
vertical or horizontal
direction. Metallic strips are
used which surrounds the
4. CYLINDER HEAD:
Each head has a
suitable space for the two
air inlet valves, two exhaust
valves and of fuel injector.
5. CONNECTING ROD:
The connecting rod is a high
strength alloy steel forging with
high strength capacity. It is
It is located in the
cylinder blocks. It contains
of three section which are
bolted together male &
female joints. The
bearings, which are
pressed into the cam
shaft, support it. Each
section of the cam shaft
which extends through the
entire length carries
integral cams, which
actuate the inlet, exhaust
and injection valves.
It is a positive
displacement gear pump.
It is provided on the free
end of the base and is
driven by engine crank
shaft extension gear.
Fuel injection pump is of single acting
constant stroke & plunger type. It has
basically 3 functions:•
To raise the fuel oil pressure to a value
this will efficiently atomize the fuel.
To supply the correct quantity of the
fuel to the fuel injection nozzle
according to the speed requirement &
power of the engine.
Accurately time the fuel delivery for
efficient & economical operation of the
It is the component which
converts the heat & pressure energy of
cylinder, into mechanical energy.
It compresses air to required pressure
It receives the thrust of expanding
gases and transmits the force through