by TVRRMAN » Mon Jun 14, 2010 6:16 pm
Dick,
I think I can answer this one easily for you. in the PRR's roster, I believe the E7s were delivered as A-B pairs. The exception to this is the E8s, which were only ever grouped as A-A Pairs. There were no E8bs ever owned by the PRR (Before being asked). Please drop me a line and I think I can get you further squared away. Cab units and Booster units were typically run in sets and labeled as such. Your example was nearly right, but the A unit would be numbered 5748A and the B would become 5748B. (Note these letters only displayed on the lower rearmost number) The number boards would display 5748.
One other thing to note: the E7s were delivered originally in PRR's infamous Brunswich Green and had bronze gold striping until later on. Around 1952, they were repainted into Tuscan red and recieved Buff Gold striping (Maybe on account of paint pigment changes at this point.)
Hope this helps.