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A 1 cylinder shay or ordinary loco is indeed a whimsical beast.  It takes at least two cylinders to control which direction an engine will move and to prevent dead centering. When a drive rod broke on the real thing, they could move if the other drive rod was near the bottom or the top of its driving wheel.  If dead center, the best they hope for was being on less than level ground which if steep enough would let them coast enough to get started - hopefully in the right direction.Art
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