TRAINING REPORT

AT

COACH CARE COMPLEX

NORTH WESTERN RAILWAY JAIPUR

Submitted By

Prateek Jain(11375)

Sohanlal Swami(11352)

Pradeep Kumar Meena(11339)

CONTENTS

Air brake system

Classification

Single pipe air brake system

Twin pipe air brake system

Limitation of Single pipe air brake system

Testing methods of air brake system

Maintenance of air brake system

suggestions

INTRODUCTION

Brake: A brake is a device by means of which

artificial frictional resistance is applied to a moving

machine member, in order to retard or stop the

motion of a machine.

Air Brake System: Brakes applied with the help of

air are called Air Brakes and the system actuated to

apply this phenomenon is known as Air Brake

System.

CLASSIFICATION

On the basis of type of release, air brake system is

classified as:

Direct release air brake system

Graduated release air brake system

Types of Graduated release air brake system

Single pipe and

Twin pipe

DIRECT RELEASE SYSTEM

Air released immediately in single pass, as soon as

releasing of brakes is initiated.

Eg: freight trains

GRADUATE RELEASE SYSTEM

Brake cylinder pressure can be reduced gradually in

steps in proportion to the increase in brake pipe

pressure.

Eg: passenger trains

SINGLE PIPE AIR BRAKE SYSTEM

There is only one pipe called brake pipe running

from loco to the brake van in order to get continuity

of air for the application & release of brakes.

MAIN COMPONENTS OF SINGLE PIPE AIR BRAKE SYSTEM

Distributor valve

Auxiliary reservoir(100 Litres)

Control reservoir

Brake cylinder (355mm diameter)

Brake pipe (32mm dia).

TWIN PIPE AIR BRAKE SYSTEM

Here along with brake pipe,feed pipe also used from

loco to the brake van in order to get continuity of air for

the application & release of brakes.

COMPONENTS OF TWIN PIPE AIR BRAKE SYSTEM

Distributor valve

Auxiliary reservoir(100 Litres)

Control reservoir

Brake cylinder (355mm diameter)

Brake pipe (32mm dia)

Feed pipe(32 mm dia)

LIMITATIONS OF SINGLE PIPE AIR

BRAKE SYSTEM

If the brake pipe pressure is too low due to an excessive no. of brake applications,an emergency application will not produce a large enough volume of air flow to trip the triple valves, leaving the engineer with no means to stop the train.

If the brakes are applied before recharging has been completed, a larger brake pipe reduction will be required in order to achieve the desired amount of braking effort.

Two pipe system is better than single pipe air brake system because this additional enhancement adds the main reservoir pipe, which is continuously charged with air directly from the locomotive’s main reservoir.

This arrangement help to reduce the pressure loss problems and also reduces the time required for the brakes to release,since the brake pipe only has to recharge itself.

TESTING OF AIR BRAKE SYSTEM

Single wagon test : Single Wagon Test is performed, by

using a portable device called ‘Test Rig’. This test rig provides

all facilities similar to a driver’s brake valve. The source of

compressed air for conducting the test is through a

compressor installed in depots and workshops for conducting

various tests without the need of a locomotive.

Rake Test: A rake consisting of 56 wagons can be

tested with this rig. This rig may be used for testing

the train in yard before attaching the engine.

MAINTENANCE OF AIR BRAKE SYSTEM

Separation Of Coach & Bogie: After brake testing if

bogie needs repair like filling of oil or changing of brake

shoe,brake cylinder etc. then bogie is separated from the

coach by lifting through a crane.

JAMALPUR JACKS

It is high capacity synchronised electrically

operated lifting jacks.

Lifting coach from one side at a time.

RAIL TRAVELLING CRANE

Have two crane hooks

Main hook(35 ton capacity)

Auxilary hook(5 ton capacity)

BRAKE MAINTAINANCE

Brakes are the most important part of a train. The

maintenance of brakes consists of change of brake blocks,

adjust stroke length, change of brake cylinder, leakage in

brake system etc.

SAFE TO RUN

If all of parts for air brake system are working correctly

like brake cylinders,brake shoes etc. and the train is in

good and safe condition for running then the train is

announced as safe to run.

At last,a brake power certificate issue to loco pilot.

SUGGESTIONS

Shunting should be done earlier then the working time so

as to reduce the idle time.

Coach should be lifted from both sides during separation

of bogie to avoid damage to centre pivot.

The brake blocks should replaced on bogies as a

set.