The United States possesses the largest railway network in the world, in terms of total operating length. China and India trail behind as the second and third largest railway networks respectively.

Russia holds the record for the world's longest continuous train route with the legendary Trans-Siberian Railway. The primary route runs from Moscow in the west to Vladivostok on the Pacific coast, covering a staggering 9,289 kilometers (5,772 miles) and crossing eight different time zones. The journey typically takes about six to seven days of non-stop travel. If you consider "stitched together" routes involving multiple trains, a journey from Portugal to Singapore is often cited as the longest possible rail trip in the world, spanning over 18,000 kilometers, but the Trans-Siberian remains the longest single-ticket, single-managed line. Other massive routes include the Canadian (Toronto to Vancouver) and the Indian Pacific in Australia, but they pale in comparison to the sheer scale of the Russian network. This vast infrastructure was built to unify the sprawling Russian empire and remains a critical lifeline for cargo and passengers traveling across the Eurasian landmass today.