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Liz says
I love the answer above me – 132 hours and 30 minutes is very cute, I think after spending five and a half days in a train, plus or minus 30 minutes does not matter that much 🙂
I have to admit I have never travelled Beijing-Moscow, but I have travelled extensively by train in Russia and find the trains satisfactory enough. I guess it depends on what your benchmark is. By Chinese standards the trains are lovely, by European standards they are a bit harsh (particularly the toilets … pack extra toilet paper and hand disinfectant).
There are daily direct trains from Moscow to Bucharest, Berlin and Prague, and many more run to Warsaw (Budapest trains go from Kiyevskaya station, the others from Byeloruskaya station). The ride to Warsaw takes about 18 hours, Berlin 24, Prague 30 (two overnights) and Budapest 36 hours (also two overnights).
As to the question of "easy" — I very highly recommend buying tickets in advance, preferably even a week in advance as the trains tend to fill up. All are sleeper cars so you must reserve a bed. If the direct trains are sold out, look into other connections via Warsaw (see link below).
Otherwise, travel itself is quite nice (I have done Moscow-Prague and Moscow-Warsaw many times), but if the August weather is warm and sunny, the cars can get terribly hot. People are chatty … not much else to do … so if you speak at least some Russian you will get lots of practice 🙂 especially if you bring along some good vodka.
To check schedules, you can look at This is a Czech site (Czech Rail), but it's in English and provides good information.