Burlington Northern Santa Fe Railway is the largest of the many freight railroads in the United States. One of six North American Class I railroads, BNSF has 36,000 employees, 33,400 miles (53,800 km) of track in 28 states, and over 8,000 locomotives. It has three transcontinental routes that provide rail connections between the western and eastern United States. BNSF trains traveled over 169 million miles in 2010, more than any other North American railroad.