I managed to get it working. It ended up being a hierarchy issue — I received some feedback on the correct structure, set it up with one train rig without individual cars, and that solved things. Everything works correctly on Tracks 01 and 02.
However, on Track 03 we can’t get the bogies to orient properly using the Rail Path. Using the RIGHT rail spline results in a 90° pitch, and using the LEFT rail spline causes a 180° flip. Reversing either spline and trying all six axis options doesn’t fix it. The spline geometry looks correct in the viewport. Does anyone know if there’s a way to control the axis direction?
I also have another issue with the rigging. Rigging isn’t my strongest area, and although the train follows the track properly, the cars don’t seem to be attached to the bogies — as you can see in this GIF. I’ve looked into car‑rig setups but still can’t get them to work correctly. Any advice would be greatly appreciated.
https://drive.google.com/file/d/1ikL84kVkP1MbxVJW6NhxW9kaLWkZg_H4/view?usp=sharing
https://drive.google.com/file/d/1k7y0y_stlF0j9tcZq4IMT5Qe6d0H51lZ/view?usp=drive_link