The Lionel PWCS Ballast Tamper (6-18464) sat on a hobby shop shelf from when it was new in 2002 until purchased recently. It ran out of the box (well it didn't literally 'run' out of the box...you know what I mean :-D) but the tampers were not working. This video shows what was needed to repair it, with a short run demonstrating its operation. Fun little loco.