These cars were originally released by Walthers circa 2008. In 2017, all of the original Walthers tooling was acquired by Lowell Smith and the cars were set up for production as part of their "RailSmith Models" line (AFAIK, only available via the Lowell Smith website).
PS 10-6 Sleeper -
PS 72' Baggage -
PS 64-Seat Coach -
This 2021 car is an original Railsmith production (IE not an ex-Walthers car) -
NP Coach -