Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

You could find some marble runs that are electric I have been thinking about getting this one:https://a.aliexpress.com/_mLvDLfQ
Looks pretty cool but there are better marble "runs" available on AliExpress. You should look around at some of these laser-cut mechanical kits, lots of festival rides and marble runs.
 Alternatively I had this kit when I was a kid, and it uses a little electric motor to screw the balls upwards and you make the tracks as fancy as you want: https://www.ebay.com/itm/325274834460?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=wsK6B2EER--&sssrc=2349624&ssuid=JmgwKyT_R5G&var=&widget_ver=artemis&media=COPY
If I had the time and space I would be setting up a marble run with my engines!