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Paul, I think that is an interesting and informative animation.  But I wonder why air is intentionally restricted by the 3 cfm orifices when charging the service and emergency reservoirs of each car.  Would the reason be to spread out the release of brakes by getting the trainline up to pressure before the reservoirs are charged, so the trainline can charge the reservoirs in a closer-to-simultaneous manner, rather than sequentially from front to rear of the train?
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