The line south of the curve at the east end of the section aligned with 75th Street was built by the Wabash, St. Louis and Pacific Railway, which opened in 1880 to Chicago. That curve was a junction with the Chicago and Western Indiana Railroad, of which the Wabash owned one-fifth, and used to reach Dearborn Station in downtown Chicago. Commuter service from Chicago began as early as 1893, with trains running as far south as Orland Park, and by 1909, the service had been extended with several trains operating as far south as Manhattan. The level of service deteriorated in the 1930s, with commuter operations effectively reduced to one train in each direction making local stops from Chicago to Decatur. By 1964, the once daily Chicago–Decatur trains were cut back to Orland Park.