Track and Motorised Thomas Mini's?

Wow, I can't wait to see this super small motor. What voltage?

It is anything from 1.5v up to 6v, so pretty flexible, I would probably want to run it at 1.5v partly due to wanting to keep the battery as small as possible, partly as I don't want it running at full speed as it will be fast, these things can apparently suspend a small drone (well 4 of them that is) or power a 'foam' plane.  This may all end up a fools errand, but I just fancy trying it, first I'll just figure how to fit the pinion/worm and then where/how to mount it on the mini chassis and clip on a button cell in a holder and see if it runs at all.  One thing the motor may lack is torque, but a mini is pretty light so I'm hoping it will still be fine.

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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.

Hi Dala,

Yes, thats the type, as I said in my reply to Super I'm not sure if they'll have enough torque and of course they will likely want to run far quicker than I need, hence the pinion/worm arrangement.  But, these things are never solved in a day, I'm happy to spend a couple of £'s on components and sacrifice a duplicate mini as a test bed.  If it works then I'll be over the moon, if it doesn't because its say too fast then I'll have to figure out a better gearing arrangement.  To start though I'll try with what I've ordered and see how it goes