I have I think 2 sets from Lionel.
The NYC 4 pack and 2 pack meant to go with the PA-1 from around 1997, and some N&W cars (I think early-mid 90's) that I bought to use as an alternate train behind the Warhorse J (no, I didn't let it bother me that the J was weathered and the cars were not! )
-Dave