Connectivity

[joefryfry]

I don't think I can get the rails much cleaner. And why would one engine work better than the other? I think my big question was on the contacts on the engines. Would it be worth my while to remove the contacts and solder some wires?

I've read some things about certain products that if you put them on the rails causes "arcing" that leaves more residue than you started with. The labelle oil worked pretty good on my HO, but doesn't seem to help here.

Thanks.