I'm surprised you don't have problems with Magic Erasers, being water based I'd expect them to promote rust pretty quickly!
I was not aware of that, I have been using them for about eight years. There have been times when the layout has set for months and the track has gotten really dusty. I can back the train around the layout once and eliminate any contact problems. Because you have pointed that out Gunrunner I will do a close inspection of the track tonight and update.