Here is a video on the Bachmann On30 Norman Rockwell Christmas Trolley Set. This is a battery powered set that has a point-to-point track arrangement with an auto-reversing circuit. So, the trolley will go to one end of the track, stop, pause for a bit then reverse and head to the other end of the track. Since the track power connector is a USB-A connector, you can use most USB power banks you might already have for your phone or tablet. Similarly, you could use a USB power adapter to power the set with wall power, but of course you wouldn't have an on-off switch.
Amazon link to set: https://amzn.to/3FqYaly
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Here is the full video on the set:
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