On30 Shay Jumping Track?

[tbdanny]

Has anyone had a problem with their Bachmann Shay jumping the track on curves? Mine is, usually when running in reverse, with the cylinders on the inside of the curve. This is happening on curves as tight as 18".

Also, when reversing over curves with the cylinders on the outside, it seems to 'wobble', due to something going on with the mechanism.

I'd like to try and get this sorted out, as I do like the shay.