Clark Junction edit
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Market Street branch edit
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Marshfield Junction edit
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Randolph Street edit
Cuyler edit
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North Side main line edit
| Date | Event |
|---|---|
| May 1, 1885 | C&E opens from Calvary to Larrabee |
| August 9, 1890 | C&E transferred to Milwaukee Road |
| December 30, 1899–January 2, 1900 | NW Elevated operates token service from a partially completed Wrightwood to the Loop. Only one track is in operation. The city shuts the operation down and arrests a train crew |
| May 31, 1900 | NW Elevated begins running from Wilson to the Loop. Trains run left-handed |
| June 6, 1900 | Addison and Larrabee open |
| June 7, 1900 | Grace opens |
| June 9, 1900 | Armitage, Clark, Diversey, and Webster open |
| September 1900 | Halsted and Sedgwick switch from express/local to local-only stations |
| 1905 | Willow opens |
| 1906 | Oak opens |
| March 5, 1907 | Lower Wilson opens |
| 1907 | NW Elevated opens the Ravenswood branch. Transfer bridge is added to Belmont |
| May 15, 1908 | NW Elevated begins using Milwaukee Road trackage north of Wilson. Milwaukee Road ceases passenger service north of Sheridan Park |
| November 17, 1908 | North Water Terminal opens |
| August 23, 1908 | Howard opens |
| April 22, 1914 | Work to elevated the tracks north of Wilson begins |
| 1915 | Thorndale opens |
| January 1916 | Tracks north of Wilson shifted to a wooden trestle |
| June 1917 | Milwaukee Road ceases passenger service to Sheridan Park |
| 1918 | Edgewater Beach (Berwyn) opens |
| 1919 | Howard Yard opens |
| 1920 | Buena Interchange Yard opens |
| 1921 | Grand opens, Kinzie closes |
| 1922 | 4 track elevation north of Wilson opens |
| February 27, 1923 | Lawrence opens |
| December 5, 1930 | Merchandise Mart opens |
| May 7, 1942 | Willow closes |
| October 17, 1943 | State Street Subway opens |
| August 1, 1949 | Lower Wilson closes |
| November 30, 1959–April 19, 1961 | Wilson bottleneck removed |
| 1959 | Wilson west island platform removed from service |
| January 21, 1963 | East and west platforms at Wilson taken out of service |
| 1963 | North Water Terminal demolished |
| September 20, 1970 | Grand closes |
| April 30, 1973 | Buena Interchange Yard closes with the end of 'L' freight |
| 1974 | Shop added to Howard Yard |
| 1975 | Wilson west island platform demolished |
| 1994 | Addison is rebuilt as an island platform between tracks 2 and 3 |
| October 26, 1996 | Wilson Yard and Shops burns down |
| March 6, 2015–September 20, 2017 | Wilson reconstructed |
| November 19, 2021 | Clark Junction flyover opens |
| NW Elevated switches to right-hand running |
