I didn't play around with the train settings cause it was tiresome to switch from that to the main game. If I had a cut off review of the hill I'm making with the settings and see what is changing when I'm changing the values would make this way better and reducing the friction of the hill settings and gameplay. You could chunk up each level to different phases or chapters and each time lock a certain option of your settings and make me play around with other settings to make a map for myself and run it to win. The concept is great, gameplay is too dull, I crash way too fast and gave up after crashing 4 times on a simple hill.
Idea is great! Keep it up and make it more playable and you have a nice game to play.