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

Nick, I just did some research on wood marble runs and the one you posted is 1 of 4 in a series that was rated #1 wood marble run puzzle for 2021.
  I think with all the drag of wood construction a Larger run would not be ideal for small steam power. So I have changed my mind...the one you posted is likely one of the best Current offerings for our use. Thanks for sharing!!