I have a circa 1972 Marx locomotive # 490, hums and all mechanical parts and wheels are in place, but can't go

Question

What can I try, not including take it all apart or buy a new one, I have lubricated it and am considering using contact cleaner. Track and transformer are great as other loco's run fast.

Answer 1

If it is humming and not moving, sounds like something is binding.    I believe if you check the wheels, they should turn.  If not,  I'd suggest giving a decent cleaning to the wheel and lubricating necessary parts.

I wouldn't continue to run it like that.  You could burn it out.