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[quote user="dldance"] [quote user="Bucyrus"]I understand the practice and reasoning behind cylinder cocks and the practice of opening them as an engine is started.  Are there any circumstances where cylinder cocks are opened while a train is under way, such as when drifting?  I have seen photos showinging a lot of steam emanating from around the cylinders on engines that are likely to be under way, rather than just starting.  Would it be common for there to be considerable leakage around the cylinder or valve rods?[/quote]The cylinder cocks are almost always opened when drifting with a closed throttle to prevent the vacuum in the cylinder from pulling smoke and cinders from the smoke box into the cylinder.  I don't know how common rod leakage was in practice.  It is a sign of wear.dddd[/quote]Thanks for that information.  So, when drifting with the cylinder cocks open, would there be cases where the throttle might be opened slighly to work a little steam?  Or, might an engineer drifting with the cylinder cocks open, end drifting and begine pulling by begining to open the throttle a few seconds before closing the cylinder cocks?
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