Larry,
Sorry buddy my father built the original NP proto-type right here at the Union Switch and Signal, and the original Steel City Black & Gold was on the 1st NP engine ever made, and delivered to the NP. Later the NP Yellow appeared, which when aged looked like the original GP7. That original Lionel work train was given to the people working at the Union Switch & Signal for their work on the NP, I own one of those Lionel original work trains.
PCRR/Dave