@Tuppence007: Thanks, that sounds logical.
I'll try to fix these in the future, I don't know if anyone even uses my limos as buses :D

I have a theory, but it's not confirmed. A while back I had an issue with this bus ( https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=765631743&searchtext=gmc+rts ) where in left-sided cities it would revert to the default bus model as soon as it left the depot. We never managed to solve the problem, but it's possible that every bus model actually contains two models - one for LHD, one for RHD. So far I've never seen any workshop busses utilise the feature, but the default bus does actually change sides.

Does anyone know what causes the enormous file size when I make a bus? This is about half megs as a residential vehicle