Russian Railways has introduced a special offer for travel on train #19/20 between Moscow and Rostov-on-Don. A ticket for an upper berth in a compartment costs 1,999 rubles, according to Travel.ru.
Tickets are on sale until April 23, and travel is possible from May 13 to June 13 (except June 9 from Moscow and June 12 from Rostov). The promotion can also be used for shorter routes on this route. In this case, tickets should be purchased for the full Moscow-Rostov route and used only for that portion.
Source: travel.ru