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Les, you're right that a 'one lunger' can be started with 'manual intervention'.  The little vertical steam engines we played with as kids could rotate either direction IF we 'helped' them.But how big an engine can you help?  One could actually lift a VW Beetle back on to the road when stuck in snow, but a Caddilac was a different horse.  Hopefully, the little 1 piston shay compares well with the VW.When a piston is at rest at the end of it's stroke, it knows not what to do.  The quartering (thirding?) of a two or three piston engine eliminates that indecision.Of course the electric motor you intend to add to the drive system also solves the problem.  But a broken main drive rod on a big steam engine could pose quite a problem.Art
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