The trains for collisions are as follows
-BNSD 70 Mac
-BNSF SD 70 Mac
-CSX SD70 Mac
-KCS 70 Mac
-NS SD70/75M
And on the Multiplayer could it be something in the code? I'm not for sure I'm just guessing,
I just attempted with buying one while in game and then leaving and coming back, it didn't work