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[quote user="rfpjohn"] I'm guessing that who ever made the cut to separate the engines away closed BOTH angle cocks, the one on the engines (proper) and the angle cock on the cars (a definite no-no!). This creates a condition called "bottling the air". Even if the air is dumped on these cars, once the angle cock is closed, if an air reservoir leaks into the train line, sufficient to raise the pressure 2 pounds, this will initiate a chain reaction, signaling the brake valves on succeeding cars to release air from their reservoirs, causing an undesired release of the brakes on the entire train. If the hand brakes set on the cars is not sufficient to hold with the air brakes released, gravity takes over. This is why you always leave an angle cock, on one end of a cut of cars, open to atmosphere. This ensures that if you have a leaking triple valve (archaic term), the air will simply vent to the big world and not cause an undesired release of brakes. Been there, done that! [/quote] That is a very interesting and convincing theory about the possibility of someone “bottling the air” on the train, and the effect this may have had by causing the brakes to release on the entire train.
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