Are there any buildings that have doors that open, so I can have a track running in?

[MeowRailroad]

One thing that is very common in real life but not Trainz are warehouse or factory buildings with doors so that trains can go inside. Are there any of these available?

 

[RRSignal]

Try on the DLS:

FMA Engine shed W-E, kuid:149987:25362
FMA Engine shed N-S, kuid:149987:25363

 

[JCitron]

There are various warehouse buildings in addition to those engine houses mentioned above. Ish6 made some and there are tons more. I think even Dave Snow made some.