I did some weight testing with bags of concrete of 60 lbs each. I placed four of them on the rollercoaster car frame to get a static load up to 240 lbs (109 kg). I also got started on a longer piece of track so that I can test the dynamic load. Next week I'll get to finishing the piece of track, and stress testing that as well. I'm also looking into how to do curved pieces of track, but I'm going to hold off on that until everything else is ready.