Switchmaster issues

I have a new Switchmaster motor and when i wire it up in the Split Power Supply it will move one direction very fast and will not move hardly at all in the other. Have tried different resisters and it still does not work properly. Anybody have any idea what the problem could be? Thanks

First [#welcome],

What is the switchmaster, H.O. or O gauge? Also is it a DC or AC motor?

I have not heard of a switchmaster before.

Lee F.

I think it’s a DC stall-motor switch machine, like a Tortoise, used by scale modelers.