The newspaper "Rossiiskaya gazeta" says the service will start on January 15 on eight overnight-train lines connecting the main cities in western Russia.
The compartments will be an option in first- and second-class carriages, while third-class open-plan sleepers, known as "platskart" in Russian, will remain mixed.
(AFP)
RFE/RL In Russian
UPDATED CONSTANTLY: Visit RFE/RL's Russian-language website, featuring news, analysis, features, streaming audio, and more, in Russian, from RFE/RL's Russian Service.