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 consistently maintains the world's largest railway network, boasting over 220,000 kilometers (approx. 136,700 miles) of operational track. Unlike many other nations, the U.S. network is heavily dominated by freight transport rather than passenger rail, serving as the backbone of the North American supply chain. China holds the second position with a rapidly expanding network of roughly 159,000 kilometers, notably leading the world in high-speed rail specifically. Russia ranks third with approximately 105,000 kilometers, including the legendary Trans-Siberian Railway, while India follows with over 68,000 kilometers, carrying one of the highest volumes of daily passengers globally. While many European countries have higher rail density, the sheer geographic scale of the U.S. ensures its network remains the longest by a significant margin in 2026.