11-30-2014, 12:20 PM
I had a similar problem with a Proto 2000 sw7. I discovered a broken wire on one of the pick ups on the front truck. The area where the switcher would always stall had one rail a little lower than the other, so the switcher's rear truck wheels would lose contact on one side, causing the locomotive to lose all electrical contact because of the broken contact wire on the front. The rear truck didn't have much play in it, and this dip in the rail was so slight I never noticed it -- put the two issues together and the result was a stalled loco. All my other locos ran fine over the spot. It is possible you have the same situation. It is amazing how much havoc a loose or broken wire can cause! I hope you find a solution without too much frustration.
Chuck
Chuck
Detroit Connecting
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inner-city connection.