Moscow – Vladivostok:
Train 002M, « Rossia », goes on odd-numbered dates from Moskva Jaroslavlskaja 16:27 MSK, to Vladivostok 23:06 MSK six nights later (06:06 local time the following day).
Moscow to Vladivosk on train #2 takes 6days 4hr. 59min.
Only first class (spalny vagon) or second class (kupé) accommodations exist on international trains to Beijing. Within Russia you can travel in platskartny as far as Ulan Ude or even on to Ulan Bator on Russian trains and then switch to an international train, if you want to save money or have the experience of traveling platskartny.
There is the daily Irkutsk – UB secondary service, train 264, which is not the same as the express trains 4 or 6 (the ones which run through from Moscow on certain days of the week only). Train 264 (or 263 in the opposite direction) is hard or 3rd class (platskartny) with perhaps one or two wagons of kupé, whereas train 6 has sv and kupé and train 4 has 1st class 2-berth (which some people feel is well worth the extra if you can get it), 1st class 4-berth and 2nd class 4-berth (the last two almost identical).
SV (1st class 2-berth on Russian trains) is effectively the same as kupé but minus the two top bunks – both berths in SV are at the lower level. So you get more space and privacy, and always get a window seat. On the other hand, it’s almost twice as expensive as kupé, and the social life in kupé or platzkartny is considered by some to be the most rewarding part of the trip….
Information kindly provided by