The statistic shows the number of freight cars in service (owned and leased) of U.S. class I railroads at the end of the year 2009. Union Pacific had 83,917 owned and leased freight cars in service in 2009.
The Union Pacific Railroad is the largest railroad network in the U.S. Its route map covers most of the central and western United States.
A class I railroad in the U.S. is a large freight railroad company, as classified based on operating revenue. Smaller railroads are classified as class II resp. class III.