Riverrail fan: MANY thanks for your post. I have a 0-8-0 which I bought about 2001. It was a 5-volt board which I replaced last year with a 3-volt board. But I didn't look at the tender coupler. Because of your post, I did tonight, and found that the contacts are a hair away from the axle and the coupler can flex enough that they touch the axle. I've been lucky---guess I never hit the uncouple button when pushing cars in reverse. There is no insulator. Loco has been blue flagged until I can fix this
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