Algodoo

This is a marble run I made some time in 2015. It's the first scene I made in Algodoo that I still have. I used the one line of code I knew at the time to change marble's density at the bottom and the top of the marble run. Other than that there is no scripting. The train originally had only one hopper car. At some point between 2015 and now I modified it to have two. After spending hours and hours watching the marbles go around, here are some possible jam points where the marbles can get stuck: sometimes one of the big marbles gets stuck in the exit for the small marbles and jams the gear, so I've tried to fix that; also if too many marbles enter the big green gear at once, it sometimes (rarely) causes a jam.