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I hadn’t run the layout for a few weeks.  Everything ran fine the last time I ran.  I placed one of my trusty MTH locos on track 1, and when I gave it some throttle, it turned off.  After running back and forth trying everything, I took a multi-meter, and found that one track is running on AC and one is on DC!  How the heck did that happen?!

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@RIRocket posted:

Another crazy thing is when I just start up the loco, with no throttle, it’ll just start slowly in reverse.  Track 2 is all normal.

Problem with that symptom on an MTH is- that might indicate that the smoke unit or headlight in that engine and the diodes associated with PV- taken from the motor wires in the typical harness might be compromised.

Again, a known problem specific to PS2 steam and that includes PS3/2 steam upgrade harness wired engines- PV (Positive voltage) associated with the headlight and smoke heater are connected with diodes to the motor wires in parallel to the motor. One motor wire is always connected to PV from the rectifier. This creates a situation where a short of headlight or smoke unit resistors to frame ground results in DC current across the motor and "creeping" as track power is applied.

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