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| Re: Air Brakes/BIE Question (697664) | |||
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Re: Air Brakes/BIE Question |
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Posted by Bill West on Sat Oct 25 03:24:29 2008, in response to Air Brakes/BIE Question, posted by gbs on Fri Oct 24 23:56:25 2008. I think we are overcomplicating the answer.Westinghouse’s basic 1872 idea for fail safe automatic brakes was that the air for the brake cylinders would be stored in a reservoir on each car and that the train brake pipe could then be worked with a reverse logic. -A “triple valve” on each car did the necessary reversal of logic in activating the cylinders from the reservoir. -BP pressure could then cause release and a lack of pressure would cause apply. -The triple valve also took care of recharging the car reservoir from the brake pipe whenever it was back up to pressure. The previous 1868 “straight air” system had the catch that train-break-in-two’s left the engineer with no brakes at all, the automatic system reversed that so that breaking the air line automatically caused a stop. The other posts then cover the evolution to electro pneumatic speed up of the control, the overlay of straight air for fast response and other refinements. Bill |
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