After I purchased a book about the EM-1s, I discovered they were also used in passenger service. This is my interpretation of that information.
My B&O EM-1's are being used to pull long coal trains. Staying cool and having fun with it...... Shades
I have seen photographs and movies of EM-1s on #29, #30 and #31, which were mail and express trains on the B&O. The things did have sixty-four inch drivers, which did give them some speed. B&O preferred sixty-four to sixty three inch drivers. I have seen photographs and movies of Big Sixes on those same trains. The 2-10-2s were fast, not drag freight power on the B&O, as they were on SP, also. William Price took most of those photographs and movies. He was a well-known photographer and filmer of the B&O. I do not know if B&O ever equipped any of the EM-1s or Big Sixes with steam lines and signalling devices. Most of the Q-4s did have steam lines and signalling devices. SP did equip many of its F classes for passenger work. If they worked passenger trains, it was usually in the mountains of Oregon, although I have seen one or two F classes working passengers elsewhere, including an SF Peninsula commute. B&O actually wanted more FTs to use as helpers, but the War Production Board told it that it would be getting these, instead.
The EM1s were all equipped with steam lines and signaling lines. The Big Sixes were not, as far as I can tell. The Big Sixes did serve as front-end helpers for E unit diesels hauling passenger trains over some Appalachian grades, but the steam for the passenger cars came from the E units.
Originally I was pulling freight with it. The curves on the first NPBH wouldn't handle a passenger car so that wasn't happening much. Future plans call for modifying it to be a sorta NP 5000 class Z-5 Yellowstone. It will take some extensive modifications, but that will be fun!