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Posted by BIE on Mon Apr 24 05:04:34 2006, in response to Re: SMEE, posted by VictorM on Mon Apr 24 01:29:46 2006.

That would be a good description of a freight brake system of a hundred years ago. Today's freight brake uses a three part control valve which consists of a service portion, a pipe bracket portion for connecting the other two valve portions to the rest of the car air brake system, and an emergency portion This control valve is connected to a combined service and emergency reservoir as well as to the brake pipe and cylinder. In a service application, the service portion senses the service reduction in the brake pipe pressure and valves an amount of pressure from the service compartment of the reservoir to the brake cylinder proportionate to the amount of brake pipe reduction. In an emergency application, the rapid drop in brake pipe pressure triggers not only the service portion but also causes the energency portion to send all of the air from BOTH compartments of the combined service and emergency reservoir to the brake cylinder.

If you really want to read the techincal information on a modern freight car control valve:

ABDX O&M Bulletin

***W*A*R*N*I*N*G***: This file is 6 Megabytes.


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