Haymarket North Extension

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Flier from the inaugural run of the first section in April 1975
An Orange Line train crosses the Mystic River between Wellington and Sullivan Square

The Haymarket North Extension is an underground crossing of the Charles River which carries the Massachusetts Bay Transportation Authority's Orange Line. The term is also applied to the rerouting of the northern section of the Orange Line, which opened in 4 stages starting on April 7, 1975 and concluding on March 20, 1977.[1] The rerouting moved the north end of the Orange line into a new tunnel under the Charles, then along the Haverhill Line right-of-way to Oak Grove. It replaced the Charlestown Elevated, which used the Canal Street Incline and was demolished later that year.[2] An underground station at North Station and a surface station at Sullivan Square replaced elevated stations located nearby; the other 4 stations were new locations.

The extension was originally to continue further north to Reading and replace commuter rail service entirely between Boston and Reading. However, that extension was voted down by residents of Reading. Under that plan, without commuter tracks between Boston and Reading, Haverhill trains would have solely used the Lowell Line and Wildcat Branch - a routing used today only for a handful of rush hour trains and Amtrak's Downeaster service. A third express track was built between North Station and Wellington station which would have been extended north to provide express service to Reading. Due to the extension being cut back to Oak Grove, no regular service uses this third track.

Most of the stations are built in a Brutalist style, with angular concrete forms, except for the infill station at Assembly, which opened on 2 September, 2014.

From north to south, the stations added or rebuilt for the extension:

Station Opening date[1] Notes
Oak Grove from crossover.JPG Oak Grove March 20, 1977
Malden Center MBTA.JPG Malden Center December 27, 1975 Transfer to Haverhill Line
Wellington station platforms.JPG Wellington September 6, 1975
MBTA Sullivan Square.jpg Sullivan Square April 7, 1975 Separate from elevated station it replaced
Community College platform.JPG Community College April 7, 1975
NorthStationOrangeOutbound.jpg North Station April 7, 1975 Replaced elevated station; rebuilt in 2005 for Green Line access

See also[edit]


  1. ^ a b Belcher, Jonathan (5 November 2011). "Changes to Transit Service in the MBTA district" (PDF). NETransit. Retrieved 29 December 2011. 
  2. ^ Reed, Jonathan. T Facts. Retrieved 26 March 2011.

Coordinates: 42°23′46″N 71°03′54″W / 42.3961°N 71.0649°W / 42.3961; -71.0649