Blue Line (BART)

Of BART's five primary rapid transit services, the Blue Line was the most recent to open.

[3] When the SFO/Millbrae extension opened on June 22, 2003, BART extended the Blue Line to SFO.

The change was to allow single-tracking in the Market Street subway during electrical work, with only the Yellow Line running through the Transbay Tube to serve San Francisco.

From February 16, 2020 to September 13, 2020, and again from March 22, 2021 to August 1, 2021, trains terminated at Montgomery station during single-tracking work.

[11][12] From September 14, 2020 to March 21, 2021, and again from August 2, 2021 onwards, trains terminate at 24th Street Mission during single-tracking work.

September 2005 BART map showing only the Dublin/Pleasanton line operating south of Daly City
MacArthur-bound train at 19th Street Oakland in February 2019