Yep, you had it right - was connected to the wrong terminal.  Thanks everyone for chiming in. 

Thanks for the tip on using a 9v battery, engine works just fine.  Which means its my controller or the track (or me).  I'll have to check on accessory vs track outputs, they aren't marked on the controller. 

Hi,
I inherited an old Bachmann train set and am having trouble with the engine.  I've tried two different transformers - the light on the engine will light up and there is some electric buzz, but the wheels won't turn.  I wiped the surface of the track and wheels with an alcohol wipe.  I'm thinking the gears have seized,but i suppose it could be electrical as well - is there anything else i can try?