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Finding relative position across connected splines
Is there a simple way to determine the relative position of two spline controllers on separate, connected splines?   I'd like to determine what position a train car is within a train (first, second, third, etc.) when the train itself may span multiple splines.

I'm guessing that I'll need to create a list of the track splines (or a lookup table) and assign values to each spline to define 'west' and 'east' relative positions for each, but I'm wondering if there is an easier solution.
Deko Games
The distance between two cars can vary depending on the track, whether it is a line or a circle for example. But still, those changes should not be very big (expect if your track has very tight turns). So why not just compute the distance between the cars, divide it by the length of a car, and round to the closest number. That should indicate the number of cars in between.
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