The title of the "largest railway" depends on whether you measure by total track length or by the sheer volume of passengers and freight. In terms of total route length, the United States possesses the largest railway network in the world, covering approximately 250,000 kilometers (roughly 155,000 miles). While much of this is dedicated to freight rather than passengers, it remains the most expansive infrastructure on Earth. If measuring by employee count and passenger volume, the Indian Railways is often considered the "largest" single governmental railway entity, employing over 1.2 million people and carrying millions of passengers daily. In 2026, the China Railway is also a major contender, as it operates the world’s most extensive high-speed rail network, which now exceeds 45,000 kilometers alone. This network represents the pinnacle of modern rail engineering, featuring the world's longest bridges and tunnels. Whether looking at the massive freight corridors of the US or the high-speed arteries of China, these systems are the literal "backbone" of global logistics and transportation.