I was running a TSW3 service in Cajon Pass in timetable mode using a personalized loco and was routed through a building during the operation. See images from iPhone attached. I'm sorry I forget the service name but could have been switching in Barstow or something like that. Perhaps something to look into? ... or drive through ;-)
The problem is that track isn't supposed to be there, there is no track there in real life, that entrance isn't for locomotives. Why DTG added track there is beyond me.