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[quote user="Paul Milenkovic"] Me and others here weren't talking about injury from overexertion. We were talking about engine crew members being maimed when an unlatched "Johnson bar" snaps back or a screw-reverser wheel suddenly starts spinning opposite to how you are turning it. Under adverse conditions, the forces can be large enough to break an arm, a wrist, or worse. [/quote] In the live steam world you have to be careful as well, really make sure that locking mechanisim falls into place on the johnson bar. I had a johnson bar snap back because it hadn't "locked" in place and it bruised my hand pretty good. I can't imagine (or maybe I don't want to) what could happen with a 4 foot johnson bar that has 50 or 60 times the force behind it.
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