The Trans-Mongolian Railway is the branch of Russia's great transcontinental rail network that runs from Moscow to Beijing via Ulaanbaatar, covering around 7,600 km and, done as a single continuous journey, taking roughly six days. Almost nobody travels it in one sitting — the appeal is breaking the journey into stages at Lake Baikal and Ulaanbaatar — but this is also one of the more logistically demanding rail journeys in this guide, with three countries' visas to arrange and a travel and political situation that has shifted considerably in recent years. Read the whole thing before you commit to booking. See our Moscow to Beijing route guide for how this fits alongside the other Trans-Siberian variants.
The route: Moscow to Beijing via Ulaanbaatar
The classic Trans-Mongolian route leaves Moscow's Yaroslavsky station and follows the Trans-Siberian mainline east across Russia, calling at cities including Yekaterinburg, Novosibirsk and Irkutsk — the usual jumping-off point for Lake Baikal, the world's deepest lake and by far the most popular stopover on the whole route. From Irkutsk the line continues to Ulan-Ude, then turns south, crossing into Mongolia and running down to Ulaanbaatar, the Mongolian capital and a natural second stopover for the Gobi Desert and the surrounding steppe. From Ulaanbaatar the line continues south through the Gobi and crosses into China, terminating in Beijing.
How it differs from the Trans-Siberian and Trans-Manchurian
All three names describe overlapping but distinct routes that share the same Moscow starting point. The pure Trans-Siberian stays entirely within Russia, running all the way to Vladivostok on the Pacific coast without crossing into Mongolia or China at all. The Trans-Manchurian also ends in Beijing, but reaches it by continuing further east across Russia before dropping south into China through Manchuria, bypassing Mongolia entirely. Only the Trans-Mongolian threads through Ulaanbaatar, which is both its main appeal — the Gobi Desert and Mongolian steppe are unlike anything else on the route — and the reason it involves an extra country's visa and an extra border crossing that the other two routes don't require.
Classes and what a berth is actually like
Long-distance Russian and Mongolian trains typically offer a few standard classes: open-plan platskart carriages with bunks arranged along the corridor and little privacy; kupe, a closed four-berth compartment that's the standard comfortable choice for most foreign travellers; and, on some services, a smaller number of higher-end two-berth deluxe compartments with more space and sometimes a private washroom. Whichever class you book, expect a samovar of hot water at the end of each carriage for tea and instant noodles, a shared toilet, and long stretches of steppe, taiga and desert scenery that are as much the point of the trip as the destination. See our guide to how to actually sleep on a night train for practical tips that apply just as well here, and our broader how sleeper trains work guide for what to expect from each berth type before you book.
Crossing borders: bogie changes and long stops
Russia and Mongolia both use a broad rail gauge, while China uses the standard gauge common across most of the world — which means that at the China–Mongolia border, the entire train is physically lifted, carriage by carriage, so the wheel bogies can be swapped for the correct gauge. It's a genuinely memorable process to watch from the platform, but it also means border stops on this route can run to several hours, on top of the immigration and customs checks themselves. Build slack into any onward plans on days you're due to cross a border, and don't expect a fixed, reliable arrival time at the other end.
Booking: through-tickets versus stage by stage
You can, in principle, book a single through-ticket covering the whole route, but the far more common and flexible approach — and the one most seasoned travellers on this route recommend — is booking each leg separately: Moscow to Irkutsk, a stopover for Lake Baikal, Irkutsk to Ulaanbaatar, a stopover in Mongolia, and Ulaanbaatar to Beijing. This lets you actually see Baikal and the Gobi rather than passing through in the dark, and gives you flexibility if visa processing or border conditions shift your dates. Specialist rail-focused travel agencies handle much of this booking for travellers unfamiliar with Russian and Mongolian ticketing systems, which is worth considering given the complexity involved. If China's high-speed network is part of a wider itinerary once you reach Beijing, our China by train guide covers what comes next.
The current situation: read this before booking
This route has become considerably more complicated to plan since 2022. Western sanctions on Russia, reduced international flight connectivity to and from the country, and cautionary travel advisories issued by many governments have all affected how straightforward — and how advisable — this journey currently is for many nationalities. Payment cards issued by Western banks may not work in Russia at all, and consular services for visa applications have been disrupted in various countries at various times. None of this makes the route impossible, but it does mean the practicalities here are unusually changeable compared with most of the journeys in this guide. Check your own government's current travel advice, confirm ticketing and visa arrangements directly with operators or a specialist agency close to your travel dates, and treat any information here — including this article — as a starting point rather than the final word.
Frequently asked questions
How long does the full Trans-Mongolian journey take?
Around six days if travelled as one continuous journey, though almost everyone breaks it into stages with stopovers at Lake Baikal and Ulaanbaatar, which stretches the total trip to two or three weeks depending on how long you linger.
Do I need separate visas for Russia, Mongolia and China?
Very likely yes for at least Russia and China, and possibly Mongolia depending on your nationality and length of stay — requirements vary considerably and have changed repeatedly in recent years, so check current official guidance for each country well before booking.
What's the difference between the Trans-Siberian and the Trans-Mongolian?
The Trans-Siberian stays within Russia and ends at Vladivostok. The Trans-Mongolian branches south through Mongolia to reach Beijing, while the related Trans-Manchurian also reaches Beijing but via a different, more easterly Russian route that bypasses Mongolia.
Is it currently advisable to travel this route?
That depends heavily on your nationality, current sanctions and visa rules, and your own government's travel advice, all of which have shifted significantly since 2022. This is not a route to book without checking the current official position for your specific circumstances first.
Sources and further reading:
- Route and booking guidance: The Man in Seat 61.
- Entry and visa information: relevant national government travel advisories, checked close to your travel dates.