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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?
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