When I set my Bachmann HO 4-8-4 GS4 Steam Loco on the track, the drive wheels turn but not enough traction to make the loco run in either direction.  How can I adjust this, or do I have to send into Bachmann Service and have them do it?
Thank You in advance!!
His Servant and yours,
Lester

I wish to make the frogs live.  I see a small black wire and I need step by step instructions on how to do this.  Thank you in advance.  Lester in GA

What is the radius of Bachmann #4 switch?