The Indiana Harbor Belt Railroad (reporting mark IHB) is a Class III railroad in the United States. The line comprises 320 miles (510 km) of track—30 miles of single mainline track, 24 miles (39 km) of double-main track and 266 miles (428 km) of additional yard and side track—starting northwest of Chicago in Franklin Park, Illinois, traveling southeast around the city to its headquarters in Hammond, Indiana.
The line's largest yard, Blue Island, is located in Riverdale, Illinois, with other yards in the Indiana cities of Hammond and East Chicago. The Gibson Yard, located in Hammond, is arguably the largest auto-switching operation in the United States.
Throughout the 1970s and 1990s to the present, Indiana Harbor Belt operated an extensive interlocking tower system including: East End, Osbourne, Calumet, Gibson, Stewart Avenue, Graselli, 55th Street and Argo towers and switch tenders at North Harvey and Columbia Street in Hammond. They later took over State Line tower from the Chicago and Western Indiana Railroad.
 Indiana Harbor Belt Railroad Police
The Indiana Harbor Belt Railroad Police Department consists of 10 sworn and dedicated Officers, who are directed by Chief of Police Rob Olszowka, Sr. The IHB Police Department operates under the authority of both state and federal statutes. The IHB Police serve to protect IHB employees, property, and assets on or about IHB property in the states of Indiana and Illinois.
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