OK so i have 90 foot of brass indoor track powered by a 10amp controller connected at one terminal point.. Currently running 14 cars with all metal wheels. And each time i run it, even for just 1 or 2 passes, a black tarry film builds up on the rails.  Now i assume this is some sort of electrolysis with the brass because it doesn't build up when the track is off. So how do i attack this?
Use No-Ox?
Transmission fluid?
Brasso?
OR
Just get used to cleaning and be this guy ?
http://www.youtube.com/watch?v=s0ZQDxYvMoQ&feature=youtu.be

 Does Bachmann ever off promotional or discount codes? And If so where would i find them?

Has Bachmann ever made a large scale diesel,, (aside from the little yard switcher) ?

I thought i might try to collect the Big hauler beer car line. Does anyone know where i can find a complete list of the big hauler cars that are beer cars?
Thanks