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[quote user="clarkfork"] I hope somebody on line knows a lot more about airbrakes than I do.  However, it seems to me that on the ABD and newer "triple valves' one can bleed the air out of the brake cylinder without bleeding all of the air out of the  auxilary or emergency reservoirs.  To just bleed the brake cylinders one would just give the rod a jerk.  If one wanted to bleed the air out of the auxilary and/or emergency reservoir as well, he would pull on the nbleed rod for a longer time -- say 15 to 20 seconds.  I think the ABD valve came along in the 60s and the the replacement ABDW valve came along in the 70s.  I don't know what they are putting on cars today.  If I remember correctly an emergency application puts about 50 pounds into the brake cylinder but still leaves 50 pounds in both the auxilary and emergency reservoirs.  Thus when air pressure is put back into the system the car's reservoir pressures start from something like 50 pounds, not from zero.  Bottling air brakes on a train has resulted in a number of run aways. [/quote] You may be correct, but it is news to me.  I thought the ability of some bleeder control rods to stick open if you give them a quick bump was to just save time by allowing the switchman to move onto to bleeding the next car without having to stand there and hold the bleed control for the entire length of the bleed.    I have never heard that when the bleed control rod is holding open on its own, that it only bleeds the cylinder and not the reservoir.  Can anybody else confirm that?
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