Picked these up in a lot. What is the red one?

[ripley802]

I took a closer look at th engines to see how they looked internally. The red and silver ones just needed cleaned up and the rubber wheels replaced. The white one needed a bit more. It had some corrosion on the battery terminals. I cleaned it up and put a thin coat of solider. The engine would not engage at all. I tested at the terminals directly and still got nothing. If you have not taken one of the motors from these style trains apart befor you are in for a treat. These seem to be a bit more complex than the typical motor units. Once I figured out where all of the gears came from, the huge spring, and realizing that having the negative terminal de-soldiered and on one side of the casing then putting it back together, all is working now.