[5] The Atlantic Avenue elevated was reduced to a North Station-South Station shuttle by 1928 after an accident at Beach Street, and closed entirely in 1938.

[6] Just a month before, a leaking gas line had caused an explosion outside North Station that injured 50 people.

[7] In April 1975, the Orange Line was moved underground as part of the Haymarket North Extension project.

[8][9] The Canal Street loop was closed on June 18, 1977; it reopened on December 15 as a three-track stub-end terminal for the new LRVs.

[10] The west entrance to the elevated Green Line station was closed on January 3, 1981, during budget cuts.

[12] On March 28, 1997, the Green Line C branch surface terminal at Canal Street was permanently closed for construction of the new tunnel under North Station.

North Station was the terminal of the Green Line until November 12, 2005, when the new tunnel opened and service to Lechmere resumed.

[16] A pedestrian tunnel under Causeway Street, with a new headhouse adjacent to North Station, opened in early 2005.

[17] An artwork titled Currents, by Gary Duehr, was placed on the wall behind the southbound Green Line track.

[18][19] The work, which depicts Wollaston Beach in Quincy, was originally placed on the Silver Line level at South Station.

[27] A $10.5 million design contract for Arlington, North Station, and Sullivan Square was awarded in April 2020.

[29] On May 24, 2020, service to Science Park and Lechmere was temporarily replaced by buses to North Station for construction of the Green Line Extension project, leaving North Station as the northern terminus of Green Line service.