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Train Air Brakes.
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A lot of mixed information is posted here and a lot of slang terms. There is a lot to understand on freight brakes. The amount of brake pipe reduction is controlled by an equalizing reservoir in the locomotive brake valve. The minimum reduction is approximately 6 - 8 on 26L brake equipment but 5 1/2 - 7 on 30ACDW. This does not give 15 psi in the brake cylinders on a train. While it is normally true that the brake pipe reduction will result in approximately 2 1/2 X reduction to get the brake cylinder pressure, on a minimum reduction it must travel the length of the train to ensure all the brakes are applied. This usually means compensating for leakage and brake pipe restrictions on a long train. Your minimum application will result in approximately 10 psi in the brake cylinder. Enough to set the shoes against the wheels on all cars and locomotives in the consist. <br />For a better understanding of train brakes contact Wabtec for training classes. Wabtec (ne. WABCO, Westinghouse Air Brake) has classes and training manuals available on line.
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