Trans-Mongolian: Ulaanbaatar to Zamyn-Üüd

Ulaanbaatar Railways (UBTZ) — joint Mongolian–Russian venture
Mongolia
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The Journey

Navigate from Ulaanbaatar Railway Station to Zamyn-Üüd Railway Station across a span of 606km. This is an overnight service.

Scenery Highlights
  • Sunset over the Gobi Desert shortly after Choir — apricot-coloured dunes and rocky outcrops
  • Sainshand servicing stop — wide-angle view of the Gobi steppe and distant mountains
  • Traditional Gers (yurts) scattered across the landscape visible from the track between Choir and Sainshand
  • Night sky over the Gobi — among the least light-polluted skies in the Northern Hemisphere
  • Sunrise arrival at the Chinese border at Zamyn-Üüd — dramatic flat-steppe horizon
  • Tuul River valley views in the first hour out of Ulaanbaatar
Quick Facts
  • Duration

    14.7 hours

  • Distance

    606 km

  • Est. Price

    26,000–133,100 MNT (Hard Seat from 26,000 MNT; Hard Sleeper 4-berth from 44,000 MNT; Second Class 6-berth from 73,400 MNT; Soft Sleeper 4-berth from 95,000 MNT; Soft Seat from 133,100 MNT)

Official Booking Provider
Classes & Accommodations

Meals: None (hot water samovar available at end of carriage)

Ensuite: No

Meals: None

Ensuite: No

Meals: None (hot water samovar available at end of carriage)

Ensuite: No

Meals: None (hot water samovar available at end of carriage)

Ensuite: No

Meals: None

Ensuite: No

Engine / Locomotive

Diesel-electric — primarily Chinese-built CKD9A (3,150 kW) and 2TE10 (3,000 kW) two-section locomotives

Locomotive Weight

CKD9A: 138 t; 2TE10: 260 t (two-section)

Track Gauge

1,520 mm (Russian broad gauge) for the entire 606 km UBTZ line; bogie-exchange to 1,435 mm standard gauge at Zamyn-Üüd / Erlian

Braking Technology

Compressed air (Westinghouse-style) on passenger stock; vacuum brakes on older Soviet-era carriages

Route Engineering Challenges

  • Bogie-exchange at the Mongolian–Chinese border at Zamyn-Üüd / Erlian (1,520 mm → 1,435 mm gauge break) — typically 2–3 hours per crossing

  • Water scarcity in the Gobi Desert — limited servicing infrastructure at remote stations between Choir and Zamyn-Üüd

  • Extreme temperature variations: −40 °C winter (dzud cold snaps) to +40 °C summer operating conditions across the Mongolian steppe

  • Sand dune encroachment near the Gobi section (Sainshand southward) requiring ongoing ballast cleaning and track lifting

  • Permafrost sections north of Darkhan in winter, requiring seasonal speed restrictions

  • Single-track line throughout the southern Gobi section — heavy freight traffic can delay passenger services by 1–3 hours

Track operator

Ulaanbaatar Railways JSC (UBTZ, УБТЗ) — joint Mongolian (50%) and Russian (50%) venture via Russian Railways (RZD)

Route distance

606 km (Ulaanbaatar → Zamyn-Üüd)

Maximum speed

100 km/h passenger; 60–80 km/h freight

Gauge at border

1,435 mm standard gauge (China side after Erlian)

Carriage types

Soviet-era ex-Russian/Mongolian-built sleepers (platskartny, kupe), some Chinese-built modernised stock

Number of intermediate stops

19 official stops (12 request-flag halts in the Gobi section)

Major servicing stops

Choir (4–5 h into journey); Sainshand (8–9 h into journey)

Border bogie-exchange time

2–3 hours typical at Zamyn-Üüd / Erlian

Onward connection to Beijing

Yes — Trans-Mongolian continues to Beijing (~31 h total via Erlian); separate Chinese rail ticket required

Onward connection to Moscow

Yes — northern branch from Sükhbaatar continues to Ulan-Ude and Moscow via the Trans-Siberian (5–6 days end-to-end)

Currency on board

Mongolian Tugrik (MNT); USD and Chinese Yuan occasionally accepted by platform vendors

Recommended booking window

2–4 weeks ahead in summer; 1 week in shoulder seasons

Quick Facts
  • Duration

    14.7 hours

  • Distance

    606 km

  • Est. Price

    26,000–133,100 MNT (Hard Seat from 26,000 MNT; Hard Sleeper 4-berth from 44,000 MNT; Second Class 6-berth from 73,400 MNT; Soft Sleeper 4-berth from 95,000 MNT; Soft Seat from 133,100 MNT)

Official Booking Provider