In March 2020, the national rail network comprised of track over a route of and 7,325 stations. It is the fourth-largest national railway network in the world (after those of the United States, Russia and China ). 36.83% of routes are double or multi-tracked. As of April 2020, or 58.49% of the routes have been electrified with 25 KV AC electric traction. It is one of the busiest networks in the world, transporting 8.086 billion passengers and 1.208 billion tonnes of freight annually. Indian Railways is the world's eighth largest employer, with more than 1.254 million employees as of March 2020. As of March 2020, IR's rolling stock consisted of 293,077 freight wagons, 76,608 passenger coaches and 12,729 locomotives.