Artie : Than you for the complement. Yes they made an Erie and a NYC (in 3 versions: brown, orange, and tan) , a PRR (Baby Ruth), a PRR (not Baby Ruth), and a A.T.S.F. They also made 3 variants of the SP car like mine (red/brown) and 2 versions in light brown. By the way, the "orange" that I list is not the later bright orange of some of today's cars but a muted somewhat dulled brownish orange.
All of these are available and relatively modest in price on collector sites EXCEPT the orange/brown door NYC and the PRR Baby Ruth which seem to command a very hefty price increase (especially the Baby Ruth) . My advice unless you are a collector, these premium priced variations do not offer any operational advantage, its just the scarcity of the livery. They are great boxcars, super detailed , die cast trucks, metal frame, and automatic couplers on both ends. They were Lionel's premium in the late 40's to the early 50's. Only caution is that by later MPC standards they are somewhat heavy. Now the good news on that is that it makes them good trackers both pulled and pushed but you do have to use a locomotive with some power especially if you expect a long string. My layout can't stand long trains, too small, so I have no difficulty with one or two in a train along with other type cars.
Good luck in the hunt, they are reasonably available but rare enough to be fun and challenging to find.
Best Wishes
Don
