I just had a similar problem.
Had one that when the control lever threw it one way, the turnout threw and the motor stopped.
When thrown the other way, the motor hummed after the turnout threw.. (that split second or so that one holds the lever up after the initial push and not quite release the lever.)
Checked the non derail by gnding the curve and the straight. Curve threw and quit. The straight threw and kept humming while the jumper was applied...which means loco wheels would cause the same thing.
Looked for butted ends...nope. Took the turnout out of the section and bench tested it alone, same problem.
Took the controller off...same problem. Turned the thing over and noticed that one magnet was not seated fully in the body. Pulled it, glued it and put it back and that solved the problem.
I think what happens is that the magnet sticking out did not let the internals throw all the way and engage the microswitch in there that breaks the circuit. I am thinking that anyway.
Perhaps this will help someone else before they dissect a switch or return it for service.
Greg
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