This thread about the Vulcan Building
http://cs.trains.com/mrr/f/11/t/255479.aspx
Reeminds me of a one story building in downtown Baltimore that is now an athletic club. My faulty recollection was it was a loco shop for WM or Ma & Pa, but it could have been a car shop.
I haven’t figured out the right terms to google up anything relevant.
Was it Western MD or Ma & Pa or Pennsy?