Hey,
I was working on some projects and my Thomas model came up on the to-do list. He wasn't running right to I disassembled the wheels and cleaned them with rubbing alcohol. After I reassembled everything and added some Labelle 108 light oil to the final drive gear, the test had nothing happen. Did I mess something up on the contacts? They are behind the wheels the way the should be. Motor doesn't run, click or anything. I was going to order a new drive for him next week, but I want to make sure this is the problem.
It could be that you broke a wire someplace.