Classic Streamliners - TRAIN​CYCLOPEDIA

Common Carrier Freight Railroads in the United States - I
About 700 railroads operate common carrier freight service in the United States. There are about 150,000 miles (240,000 km) of railroad track in the United States, nearly all standard gauge.

Reporting marks are listed in parentheses.

Idaho and Sedalia Transportation Company (ISR)
Idaho Northern and Pacific Railroad (INPR) (RGPC)
Illini Terminal Railroad System (ITRS) (RRC)
Illinois and Midland Railroad (IMRR) (GWRR)
Illinois Railway (IR) (OMLX)
Illinois Western Railroad (ILW) (EFRR)
Indian Creek Railroad (ICRK) (RAFX)
Indiana and Ohio Railway (IORY) (GWRR)
Indiana Eastern Railroad (IERR) (RRC)
Indiana Harbor Belt Railroad (IHB)
Indiana Northeastern Railroad (IN)
Indiana Rail Road (INRD)
Indiana Southern Railroad (ISRR) (GWRR)
Indiana Southwestern Railway (ISW) (PREX)
Iowa Interstate Railroad (IAIS) (RDC)
Iowa Northern Railway (IANR)
Iowa Northwestern Railroad (IANW)
Iowa River Railroad (IARR)
Iowa Southern Railway (ISRY) (PGR)
Iowa Traction Railroad (IATR) (PGR) - NFL Jerseys and Gear
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