Arlington station (MBTA)

The now-closed Public Garden entrance, 1937

After the success of the original Tremont Street subway in 1897–1898, there was a push to extend the tunnel under Boylston Street towards Kenmore Square.[3] During 1913 tunnel excavations near the present-day site of Arlington station, remains of ancient fish weirs built by Native Americans were found approximately 30 feet (9.1 m) below street level. Their age has been estimated as between 2,000 and 3,600 years.[3][4]

Businesses in the Back Bay neighborhood along Boylston Street between Clarendon and Tremont Streets became worried about loss of income due to being bypassed by an uninterrupted 4,000-foot (1,200 m) tunnel between Boylston and Copley stations, which was completed in 1914. They lobbied for an infill station near Arlington Street, but were rebuffed by the Boston Elevated Railway and the state legislature. In 1915, with the backing of Boston mayor James Michael Curley, they succeeded in getting legislative approval for a new underground station.[3]

After delays caused by World War I, Arlington station finally opened in 1921.[1][5] Escalators from the platforms to the lobby were added in 1951 – the westbound on June 11, the eastbound on November 7.[6] With the platforms 55 steps below ground, Arlington had been the deepest station on the system without escalators.[7]

The MBTA wanted to improve its graphic design in the early 1960s, so they hired Cambridge Seven Associates graphic designers to make it easier for people to understand. Arlington was used as their pilot project for testing modernization ideas, including the (T) "lollipop" sign, the colored walls and signage distinction between "inbound" vs "outbound", the high-contrast photographs on the walls, and the colored bands along the wall and above the entrances.[8] At the platform level, the wall at the inbound end of the station was painted with "warm" colors red and orange, while the outbound end was painted with "cool" colors blue and green.[8] A dedication ceremony was held on August 17, 1967, with the renovation fully completed in 1968.[9][10][11]

The Berkeley Street entrance was closed on January 3, 1981 as part of extensive cutbacks that including closing Bowdoin and Symphony stations.[12] Those stations later reopened, but the Berkeley Street entrance did not.[1] A secondary name of Park Plaza, used on some station signage, was added in 1985 as part of a series of station name changes.[13]

Boston Marathon crowds in the Berkeley Street passageway during renovations

On November 22, 2006, the MBTA closed the Arlington Street entrance to the station to begin a major renovation of the station.[14] Conducted in concert with similar changes to Copley, the project added elevators and raised platforms to make the station accessible. The street elevator was placed in front of the Arlington Street Church along with a new set of stairs, and the northwest entrance was relocated. The 1981-closed Berkeley Street entrance was reopened for the duration of the project.[14]

On May 31, 2009, the renovated main entrances on Arlington Street temporarily reopened for public use; the Berkeley Street entrances were reverted to emergency-only exits.[15][16] Panels of artwork were added to the station at the platform level. Designed by Ross Miller, these panels explain and celebrate the ancient Boylston Street Fishweir that had been discovered during excavations in the vicinity.[17][18]

The MBTA plans to add three elevators to the Berkeley Street lobby and reopen it as a full entrance. A $10.5 million design contract for Arlington, North Station, and Sullivan Square was awarded in April 2020.[19][20] Design work reached 30% completion in 2021 and 75% completion in 2022.[21][19][22] Track realignment at Arlington and Copley, which will deal with Green Line vehicle doors becoming stuck on the platforms, is expected to take place in the mid-2020s.[23]