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[quote]QUOTE: Originally posted by CSSHEGEWISCH CP's Royal Hudsons were also equipped with a screw reverse. Maybe some steam expert can help me out with this: Many years ago, I was aboard a stern-wheel towboat which was a museum exhibit in Keokuk, IA. It was a tandem compound and had separate controls for reverse and cutoff. Is there any reason for the separate controls as opposed to a single control as on a locomotive? [/quote] Without knowing what valve gear was used, I can't say for certain, but my guess is that unlike a locomotive valve gear, the boat's valves were not directly and solidly connected to the crankpin. Some valve gears operate whichever way the wheel is turning, but cannot inherently reverse it, and I hypothesize that this was one which could reverse, but in which there was no "reversing link." The reversing link makes the cutoff tied to the position of the reverser. If you could tell me more, I might be able to come up with some more mindless gobbledimuck [:)]. Sincerely, Daniel Parks
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