to Lionelzw - I have some of the 0-31 Older K line and Lionel K-line - 1 out of 5 has had problems - works for a while and the will on;y remotely turn one way ot the other. I've had 4 repaired by some one who can open them up and do resoldering on the fine wires in the switch motors.( I think that was what went). The 0-72 switches worked fine.
I used 6 of them for high speed movements as crossovers from one loop to another. Dont see very many on E***.
RMT has them coming out soon. I'm going to try a pair. Walter says they have improved them from the K-line design.