Thanks! It's going to haul heavyweights, but this was a test run--I need to loosen the wheel mount screws, apply loctite, then tighten them down and let them sit over night. It should be able to manage the four heavyweights it pulled before, but we have one very steep grade and it might only make three

Looks good Low note.  Hope it will pull the Heavy weights with out problems.  Be an interesting test.  Later RJD

Awesome idea!   You've really made a nice little engine!