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I have a cool Lionel Hobby Shop on my layout, 6-85185. I had her wired direct to a 12v AC wall wart. All was well for 2 years, but now she simply flickers for a quarter second and will not operate. Went direct to track power with the same result. Replaced the PCB with the same result. I'm at a loss. Could the gearbox be locked up and overload protection be kicking in?

On a side note, if you ever service one of these, be aware that there are LOTS of screws. A truly ridiculous amount of screws. Someone had a cousin in the screw business.
 

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If it's not the PCB, I'd check the geartrain, it's not that hard to rotate the motor either by hand or unplug any connection and power it with a few volts DC. What's called for is a divide and conquer strategy here, eliminate possible issues until only one remains.
 
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