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<P mce_keep="true">[quote user="Paul Milenkovic"]The torque comes from the contact of the wheel with the track.  At top dead center, the side rod is unable to transmit torque to the second axle, but the track certainly can.  So long as the wheels do not slip, they have to turn the same way, hence that indeterminate condition at top dead center where the second wheel and axle turns the opposite way cannot happen.[/quote]</P> <P mce_keep="true"> That is an excellent point.  I hadn't thought about the relationship through the rail contact.</P>
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