You guys are way above my pay grade.
I am just removing my Lionel Southern Pacific AC-12 from its box. 6-38071. After last years taxes were done, it was an expensive purchase and has sat in its box for over a year. Purchased used with very little run time on it, the first operating session revealed why it had so little run time. It runs like cra... um... poorly - jerking and herking, loping along.
Hope I can figure it out.