Track and Motorised Thomas Mini's?

I happened to keep two of that type (+an even smaller one for the tail rotor) from my first RC helicopter, which I have yet to find a use for 'because' they're too small for me and most of my gears are too big to mesh with them. They could work for something like opening doors on a modern passenger train, but are otherwise underpowered and too fast even on 1.5V. Here they are next to one of my average motors for scale:



One advantage they have is they all magnetise to each other (as well as other motors), making them a bit harder to lose. Wonder how this will go for you when it arrives.