The US rail network, with an operating route length over 250,000km, is the biggest in the world. Freight lines constitute about 80% of the country's total rail network, while the total passenger network spans about 35,000km.
The US freight rail network consists of 538 railroads (seven Class I railroads, 21 regional railroads, and 510 local railroads) operated by private organisations. Union Pacific Railroad and BNSF Railway are among the largest freight railroad networks in the world. The national passenger rail network Amtrak comprises of more than 30 train routes connecting 500 destinations across 46 American states.