This photo is a sleeping car, which was exhibited in the Novosibirsk Railway Museum.
This sleeping car made in East Germany(GDR), and it was working in USSR.
Own weight: 58 tons
Body length: 23600mm
Bed seats: 36
This sleeping car made at 1976, and it made by Waggonbau Ammendorf .
Body side written "Сибирская железная дорога".
English meaning "Trans-Siberian Railway", so this sleeping car is working in the Trans-Siberian Railway.
If I have been riding the Trans-Siberian Railway whole line during the Soviet era, it might have been riding on this sleeping car.
The other side photo.