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In 2009, 7 major railroads existed in the United States compared to 14 in 1990 (United States Census Bureau, 2012)

There was an estimated 160,000 miles of railroad in the United States for 2010 (Association of American Railroads, 2010)

Every 120 minutes in the United States, there are train collisions with motor vehicles or pedestrians (Chattar-Cora, Tutela, Daum, & Cromack, 2007)

In 2005, railroad trespassers accounted for 53% of rail fatalities (Savage, 2007)

The transcontinental railroad was built in the 1860s as a means to link the eastern US with the west (The first transcontinental railroad, nd)

Sources:

American Association of Railroads. (2010). Class I railroad statistics. Retrieved from: http://www.aar.org/~/media/aar/Industry%20Info/AAR%20Stats%202010%200524.ashx

Chattar-Cora, D., Tutela, R., Daum, A., & Cromack, D. (2007). Experience with railroad injuries at a major urban trauma center serving the United States-Mexico border. Journal of Trauma Injury, Infection and Critical Care 62, (5), 1123-1126.
Savage, I. (2007). Trespassing on the railroad. Research in Transportation Economics, 20, 199-224.

The first transcontinental railroad. (nd). Retrieved from: http://www.tcrr.com/

United States Census Bureau. (2012). Table 1122: railroads class I summary: 1990-2009. Retrieved from: http://www.census.gov/compendia/statab/2012/tables/12s1122.pdf