Russian Railways has introduced a special offer for travel on double-decker train #103/104 between Moscow and Krasnodar. A ticket for a compartment, including lower berths, costs 999 rubles, according to Travel.ru.
Ticket sales are still unknown, but travel is possible until April 26. This promotion may not apply to travel on holidays.
The promotion can also be used for travel on shorter routes on this route—for example, Moscow to Rostov-on-Don, Krasnodar to Voronezh, Ryazan to Rostov, and so on. In this case, tickets should be purchased for the full Moscow to Krasnodar route and used only for that portion.
Source: travel.ru