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. Detailed profiles of the top five railway networks worldwide, taking into consideration their extensive coverage.

The United States maintains the world's most extensive railway network in 2026, totaling over 220,000 kilometers (approx. 136,700 miles) of operational track. This vast network is largely dominated by private freight carriers like Union Pacific and BNSF, which form the backbone of the nation's supply chain for coal, grain, and intermodal containers. While the U.S. leads in total length, it is famously lacking in passenger rail density compared to its closest rivals. China holds the second spot with a rapidly expanding network of nearly 160,000 km, though it leads the world significantly in high-speed rail specifically (42,000+ km). Russia ranks third, home to the legendary Trans-Siberian Railway, which remains the longest single rail line on Earth. India follows in fourth place with a network exceeding 68,000 km, serving as one of the world's busiest passenger systems. Despite the U.S. having the most miles, only about 1% of its network is electrified, whereas countries like Russia and China have electrified over 50% of their lines, reflecting a focus on heavy diesel-powered freight in the American system.