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Brake Question
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The pressure in the line DOESN"T force the brakes off the wheels. Without any pressure in the system in any part the brakes are released. The only way the brakes are applied is when the brake cylinder is pressurized. <br /> <br />When the train goes in emergency the air from the emergency reservoir (half of the air tank under the car) is vented into the brake cylinder, putting on the brakes. If the seals are worn or the pipes or valve leak, the air will eventually leak out of the brake cylinder and the brakes will release by themselves. That's why railroad rules say that air brakes cannot be counted on to hold a cut of detached cars, the crew has to apply handbrakes. <br /> <br />There is a valve that bleeds all the air out of the system which then releases the brakes so the car will roll free when being switched. <br /> <br />Dave H.
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