Here break fails means break was applied but had no effect on the speed of the train, that may be called as brakes fail of a running train.
Let's try to understand in simple words how brakes are applied in train including Loco? Train brake is applied through air pressure. Two compressors build this pressure. This pressure stores in four main reservoirs. In the main reservoirs, the pressure maintains at 8.5 kg to 10.5 kg through pressure relay. It starts and stops the compressors.
A BP ( Brake Pipe) is distributed throughout the train. BP charges through A9 valve from the Locomotive driving cab. BP pressure is maintained at 5 kg/cm^2. In this position, brakes are released. When pressure drop brakes are applied. Here is a pic of three main parts of a wagon in connection with brakes application.
Auxiliary Reservoir(AR), DV(Distributor valve) and brake cylinder. DV balance in 5 kg pressure of BP pipe. At this situation, brakes are released. Here is a picture when the brake cylinder piston is in position and brakes release.
When BP pressure is dropped by Loco pilot or by any reason with certain dropping rate, DV gets unbalanced and pressure goes to brake cylinder from Auxiliary Reservoir through unbalanced DV. The piston comes out from cylinder and through a mechanical arrangement, brakes applied on the wheel. Here is a picture of applied brake cylinder when the piston gets out from the cylinder.
Finally, breaks apply through a mechanical connecting system. With the adhesion of Brake shoe on wheels, it produces frictional force and thus reduces the speed of the train. Here is a picture of break shoes with a wheel.
Now by it is clear that by any means pressure drops in BP, brakes must apply on wheels.
Brakes may be not applied after pressure drops in one condition if there is a problem in mechanical arrangements of the brake application system. So far my knowledge It is practically impossible. An MV 5, a brake power certificate issued for every train after a throughout mechanical checking by experts of each wagon of a train.
Loco pilot and guard of all train must do a continuity test after taking charge of any train before departure. Loco pilot drop pressure from his loco and guard of his train acknowledge that. Now Guard of the train drop pressure from guard brake van and Loco Pilot acknowledge that. It ensures the continuity of BP pressure throughout the train.
Another safety precaution is taken during continue test. ALP will check first 10 coaches ensure about brakes application and the guard will check the 10 coaches from his side to ensure about brake application physically.
Next on run Loco pilot apply brakes at starting after reaching a minimum speed to get confirmation of brake application of his train. It also ensure that brakes applies on wheels.
So far my knowledge mechanical failure cannot take place at a time with all the wagons or coaches of a train. Thus as per my knowledge, there is practically no chance of brake failure in a running train.
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.
1 comments:
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