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Here is an interesting read about freight train brake: <a href="https://www.quora.com/How-do-trains-stop">https://www.quora.com/How-do-trains-stop</a> Quote: ......One factor to take into consideration is that the auxiliary reservoir on each car is 2500 cubic inches in volume. The brake cylinder on the other hand is only 1000 cubic inches in volume. This result is a 2.5:1 ratio in air pressure between the reservoir and the cylinder................ The emergency reservoir, which we have not discussed until now is larger than the aux reservoir, boasting 3500 cubic inches, giving it a 3.5:1 ratio to the brake cylinder................. A gush of air is sent through the train causing a chain reaction that moves at 930 feet per second rather than the service rate of 540 feet per second. Additionally, 77 lbs of force is exerted on each brake cylinder rather than the max service application of 64lbs.................. I think passenger cars will be equipped similarly. Yes it is air brake 101 but not what Joe tried to explain. Regards, Volker
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