Skarloey would be proud of these :D

Very nice models, and very much needed for 2ft rail. If anything, it just makes me wish driveable narrow gauge engines would eventually pop on the workshop eventually.

is the Physical Properties a mod or is it not?

Yes, but you need to turn them into Super Ice with your Physical properties gun to make them slippery, and then place them on the rails

does it really move like in the twitter video or is it a prop