The Trans-Siberian railway is the longest railway in the world, so traveling on any leg of this railway is a once in a lifetime experience. Traveling the full railway length is a total of 9259km from Moscow to Vladivostok. Most travelers tend to travel the Trans-Mongolian leg, which you can pick up in Beijing, China with Intrepid Travel. The Trans-Mongolian Express tour with Intrepid Travel is a 21 day trip which travels in one direction from Beijing to St Petersburg, Russia and passes through Mongolia. The tour includes: Accommodations as follows: Hotels (9 nts), Mongolian ger (1 nt), guesthouses (2 nts), overnight trains (8 nts) Transportation: Overnight train, minivan, local bus, local train, metro, taxi, ferry, boat. The Trans-Mongolian Express tour is priced from $3930 USD per person.