Owned 3rd Rail PRR M1a mountain for about 7 years.
Last night the sound system started acting up -eg: hit the whistle bitton and the whistle would blow continuously.
Then the locomotive started stopping indicating a short on the Z-4000. Put it on the test track and luckily noticed a spark under the tender.
Found that pickup roller assembly, instead of being fixed, could rotate right or left on the fastener to the tender.
I positioned the pickup roller so it did not spark. And put it back on the layout.
Ran it now for about 20 minutes without any problems
May eventaully have to fix this ability of the pickup roller assembly to rotate off dead center.
Any suggestions..