Pennsy Self-Propelled Units

Overhead Electric	25KV electric units
MP54E1		Standard all-passenger electric multiple unit car. Hundreds of these were built. This is an early, unrebuilt car, but the differences at this scale are minor.
MPB54E3		Electric motor combine car, half coach, half baggage. According to Pennsy Power II, only five of these were built. They normally each ran with a trailer car.
MB62E1		Full baggage electric motor car. These were rare.
MP54		The MP54 was originally a locomotive-hauled suburban coach car; after self-powered units came to be, unpowered cars remained in existence to be pulled by the powered cars.
3rd Rail Units	Non PRR Multiple Units
LIRR MP54 Clerestory (Tuscan)		The Long Island MP54 units were related to the PRR ones but were 3rd rail DC instead of overhead 11KV AC. This one is in the original Tuscan and has the clerestory roof that the PRR cars all had.
LIRR MP54 Clerestory (Grey)		Later, they were repainted in a mid-grey as the LIRR began to assert its independence from the PRR.
LIRR MP54 Monitor (Tuscan)		Other LIRR MP54s had a "Monitor" roof. This was a rounded, arched roof with very large ventilators spaced along it.
LIRR MP54 Monitor (Grey)		These were also repainted grey later.