What entity are you trying to use it with?
#func_tracktrain starts spinning uncontrollably
runic fjord
stoic isle
Prop_dynamic_override is parented to the func_tracktrain
Other than that it's a normal train on the path tracks.
barren shuttle
how are your tracks positioned
the turns are very sharp, so they seem to be at right angles
if you make a curve, that will not only look better, but may solve the issue
barren shuttle
also realistically, the tunnels themselves would have more of a curve to them at the corners
even at intersections
barren shuttle
also it seems like it gets out of whack as soon as it completes a full loop
radiant plover
Have you tried using a tarmac or gravel material for the road? It looks like the bus fishtails and spins out on the flat surface, maybe using a rougher material could add a bit more friction