Currently, the Railways of PRC operates several couples of international trains running between China and Russia (Moscow, Khabarovsk and Vladivostok), Mongolia (Ulan Bator), North Korea (Pyongyang), Kazakhstan (Astana and Alma-ata) and Vietnam (Hanoi).

 International Train Schedule:  

K3: Beijing—Ulan Bator—Moscow K4: Moscow—Ulan Bator—Beijing	T5: Beijing—Hanoi T6: Hanoi—Beijing	K23: Beijing—Ulan Bator K24: Ulan Bator—Beijing
K19: Beijing—Manzhouli—Moscow K20: Moscow—Manzhouli—Beijing	T8701: Nanning—Hanoi T8702: Hanoi—Nanning	4652/4653: Hohhot—Ulan Bator 4654/4651: Ulan Bator—Hohhot
K27: Beijing—Pyongyang K28: Pyongyang—Beijing	K7023: Harbin—Vladivostok K7024: Vladivostok—Harbin	K9795/K9796: Urumqi—Alma ata K9797/K9798: Urumqi—Astana

 Purchase an International Train Ticket
Passengers could purchase international train tickets at the railway station directly. However, it is always difficult for passengers to purchase tickets on the spot since the tickets are needed urgently. Therefore, it is suggested that passengers book tickets through travel agencies which are commissioned to sell international train tickets. The travel agencies may require relevant service charge.

International train tickets can be booked through travel agencies 40 days in advance. A deposit is required for pre-booking but this will be returned to you when you buy your ticket. After pre-booking, passengers should pay for their tickets in full at least 7 days ahead of the trains' departure date. Otherwise, the booking will be canceled automatically and the booking fee will not be returned. A valid passport is required to be presented when buying an international ticket.

 Return an International Train Ticket
1. If an international train ticket is returned 72 hours ahead of the scheduled departure time, 80% of the fare will be refund. No service charge is refund.
2. If an international train ticket is returned or changed less than 72 hours ahead of the scheduled departure time, 95% (or 20% for sleeper) of the fare will be refund. No service charge is refund.
3. If an international train ticket is returned or changed less than 3 hours after the train leaving, 95% of a seat-ticket fare will be refund but no fare will be refund for a sleeper-ticket. No service charge is refund.
4. Please note the return of tickets may not be allowed if you book the tickets through an agency. You'd better confirm the regulations of the specific agency before booking.

 Baggage Allowance
1. When taking an international train, an adult is allowed to take at most 35kg of carry-on baggage for free while a child under 12 years old is allowed to take 15kg of baggage for free. The total of the length, width and height of each baggage can not exceed 200cm.The overweighted part has to be consigned.
2. The baggage consignment should be handled in the morning before the departure date in the Beijing Railway Station International Train Baggage Consignment Counter (west wing of the station building). The custom office is closed on weekends, so passengers leaving on Monday should check their baggage in advance on Friday.
3. The consignment procedure needs  the passenger’s passport and train ticket. To consign a bicycle, leave it unlocked and unpacked.
4. The consignment charge is CNY 7.5 / kg for the Beijing-Ulan Bator train. Each bicycle costs CNY 150. The charge on Beijing-Moscow train is CNY 16.8 / kg and a bicycle costs CNY 200. The price is adjusted to the changes of international exchange rate.

China Train Tours:  10 Days Tibet Train Travel: Beijing - Lhasa - Xian  5 Days China Tour: Shanghai - Suzhou - Zhouzhuang - Shanghai  Xian - Luoyang Express Train Tour: 1 Day of Xian - Luoyang - Xian

Other Useful Resource: 
Mongolia Train Tickets: Train ticket to from Ulaanbaatar to China and Russia.
Trans-Siberian Railway: Trans-Siberian and Trans-Mongolian Railway Tickets and Tours. Budget Accommodation in Russia and Mongolia. Russian Visa Support.
Vietnam Railways: Vietnam train information and online booking