N scale 0-6-0 steam locomotive wobble

[silverflash]

Hi everyone,

I just joined the forum today and had a question for you folks. I have a Bachmann 0-6-0 steam switcher that wobbles when running in forwards and in reverse. The chassis is according to Bachmann an older one that they no longer make wheel sets for. I was wondering if anyone could give some advise on this if possible. The motor on this one does not stick out the back. Appreciate any help you guys could give me.

Thanks