I can’t think of any easy way to chop up a mesh like that. The first thing that pops to mind is using the boolean modifier, one grid square at a time (it’s symmetric, so you could just do a quarter of it and mirror it from there). That’s tedious though, and will result in lots of triangulation where it cuts. Ideally your game engine would just use the entire mesh as a whole. Another option, if your game engine supports bump mapping, you could bake a normal map of the the tracks onto a flat plane, then cut up the bump map from there.
Hmm i thought this too but there is a small issue …
Unless i can find a way to center the camera perferectly for each track piece they won’t line up - the current method i have to do it move the camera and just judge it with my eyes which is a pain cos they ever so slightly never line up correctly =/