Dave
Western Thunderer
It works and the body no longer sticks. I made the rod about 1mm longer than it needs to be and so now it tips the body as far as it can but the extra bit of travel takes the underframe with it at one side. It appears to be that the shock of the entire thing landing back on the rail gives a little momentum to the body. The voltage may need to be reduced as it looks very fast but I'll have to experiment with that as if it is too slow on the down stroke it may no longer give the jolt to the body.