Trans-Siberian from Moscow to Vladivostok, Russia The Trans-Siberian is the longest passenger train in the world and travels across China, Mongolia, and the famous, beautiful Siberia. Have you ever considered cruising over 10,214 km for seven days and 20 hours, crossing two continents and a whopping eight time zones?

As of 2026, the answer depends on whether you mean a single train or a continuous journey. The longest continuous train journey in the world covers roughly 18,755 km (11,654 miles) from Lagos, Portugal to Singapore. This 21-day odyssey requires several transfers but allows travelers to cross 13 countries on a single set of coordinated tickets. However, the title for the longest single-train route (no transfers) remains the Trans-Siberian Railway from Moscow to Vladivostok, covering 9,289 km (5,772 miles) over seven days. In 2026, a new contender for the "slowest/longest" experience is the Mauritania Iron Ore Train, where travelers can ride in open freight cars for 20 hours across the Sahara. For a more supportive and comfortable 2026 experience, the Portugal-to-Singapore route is the gold standard for "slow travel" enthusiasts, though it requires significant visa planning for the segments passing through China and Southeast Asia.