I recently purchased a Lionel bump-n-go trolley. I had a similar trolley in HO when I was a kid (no bump-n-go though), don't know why it took me this long to buy one. Fun little critters to let loose on the layout.
This one is nice and clean but the motor was gunked up with old grease. Took it all apart and cleaned everything, worm gear, commutator, gear box, wheels, etc.
It runs great now.
Everyone have a great Sunday.
GO CHIEFS!