Where can you find a map of U.S. railroads?

There is a U.S. rail map on MapsOfWorld.com, which shows the entire network of railways across the country. There are also maps of each of four major American railroads. ACWR.com has maps of many different American and Canadian railways, and a map with all Class I Carriers in North America.

MapsOfWorld.com has maps for Norfolk Southern Railway, USA Union Pacific Railroad, BNSF Railway and USA CSX Transportation. ACWR.com has maps for those four railways as well as maps for North Carolina Rail, Kansas City Southern, Canadian Pacific and Canadian National. It also provides a detailed map that includes all of the major railways in North America, with a different color designating each railroad.