We have a Bachmann North Pole & Southern 1225 Train Set (I believe it is G scale)  The set seems to be semi-complete still in the original styrofoam box (outer cover missing) with one major exception...  No transfromer/controller to run it.  What type of controller does it take and is it available?   

I had donated it to a church Garage Sale in St. Louis County Missouri, and they are trying to price it,  any suggestions? 

Jcooper