You can spawn Trains in front of you without it crashing.... 
I used the Pawfect Films studios spawner and it works(the train just floats there lol <><) 
<>< FISH 
With manual mods can u change what vehicle they are for by changing the carcols and stuff 
e.g carcols bullet 45,46 54,245    to        turismo 45,46 54,245          
and all the other files (handling, default, dff and txd). Or would the game not recognize?