E&C Shops was the original manufacturer of these models, with LBF and then Hubert's Model RR Mfg Group purchasing the tooling and continuing production later on. It is my understanding that (as of this 2015 writing) Intermountain has acquired all of the old LBF/Hubert's tooling and plans on re-releasing these cars at some point.
They're not just for passenger trains anymore! With their large size, increased carrying capacity and easy in and out center door, some railroads have acquired these 60' cars (based on Amtrak's 60' Express Box Cars) for freight service. Ideal for handling light and bulky loads that require protection from the weather, theyre hauling pulp and finished paper products on some lines.