Inside the north end doors there will be a scale house (yes it's inside, between tracks 5 and 6) as well as a bunch of other mechanical stuff.
The BLMA (now Atlas) hoppers. Wow. I have been in N Scale for 30 years and these take the cake. I got them in three reporting marks, CITX, GACX and TILX. I need to weather them all, but that will be a little ways out.