Passenger CarsI've found four RTR passenger cars, all of which are for era V (post-1990), except one (a limited run by PSK) which is suitable for the 1980s as well (era IV).
Am ep V Tillig 13500

Am ep IV-V PSK 680

ABm ep V Tillig 13501

Bm ep V Tillig 13502
Freight carsI've found seven RTR freight cars suitable for era IV (1970s-1980s). Oddly enough, most are from Czech producers in limited runs:
E ep IV Tillig 500548

Ibces ep IV Tillig 14010

Ibfls ep IV Krokodil

Ibfls ep IV Krokodil

Uagpps ep IV KPA 223

VUd ep IV Tillig 14263 (1970s)

8-axle tank car ep IV Krokodil

Two RTR models are available for the late 1980s/early 1990s (ep IV-V transition):
Gbhs ep IV-V Modist KU480

Shimmns ep IV-V Schwaetzer
Two are available for the modern period:
Hbbillns ep V Tillig 14836

Zs ep V Tillig 01342
