The Trans-Siberian Railway remains the longest railway line in the world in 2026. Spanning a massive 9,289 kilometers (5,772 miles), it connects Moscow in the west to Vladivostok in the Russian Far East. The journey takes approximately seven days to complete, crossing eight different time zones and traversing the Ural Mountains, the Siberian taiga, and the shores of Lake Baikal. While there are ambitious proposals for longer "Trans-Continental" routes connecting London to Tokyo or even Alaska to Russia, the Trans-Siberian remains the only operational, continuous line of this magnitude. For 2026 travelers, it is considered the "Everest of Rail Travel," offering a deep dive into the diverse geography and history of the world's largest country via a single, unbroken steel ribbon.