[3] The trackage is owned by Metra north of a junction with the Belt Railway of Chicago at Loomis Boulevard, and is leased from Norfolk Southern Railway south of the junction (NS has trackage rights over Metra's portion).

[4] 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.

[6] 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.

[7]: 145  The single round trip continued under the new ownership, who named the train the Orland Park Cannonball.

[15] Additional mainline trackage will also be built between LaSalle St Station and 74th to handle the increase in traffic.

[16] This would relieve congestion at Union Station and improve reliability for the SouthWest Service, as well as allowing more trains to run in each direction.

Three of the trains that travel beyond 179th Street serve Laraway Road and Manhattan as "flag to discharge" stops.