History
In 1896, tracks were laid on Commonwealth Avenue from Chestnut Hill Avenue west to the Newton town line at Lake Street, and around the same time the Commonwealth Avenue Street Railway opened, extending the tracks through Newton to Norumbega Park; this later became part of the Middlesex and Boston Street Railway. Trains between Lake Street and downtown Boston used tracks on Beacon Street, now part of the "C" Branch. From Kenmore Square they continued east on Beacon Street, then turned south on Massachusetts Avenue and east on Boylston Street to Park Square. In 1900 tracks were installed on the rest of Commonwealth Avenue, from Chestnut Hill Avenue east to existing tracks at Packard's Corner, later part of the "A" Branch. This enabled trains to use Commonwealth Avenue between Lake Street and Kenmore Square. In 1909, the tracks were electrified.
The Tremont Street Subway opened on September 1, 1897, and then or soon after the Commonwealth Avenue line was rerouted to turn around at Park Street via the Boylston Street Incline at the Public Garden. The Boylston Street Subway opened on October 3, 1914, extending the underground portion to the Kenmore Incline just east of Kenmore Square. On October 23, 1932 the Blandford Street Incline opened along with the underground Kenmore station, giving the line its present configuration.
Until the 1920s, a streetcar line that has since become the 65 bus ran along Commonwealth Avenue from Boston College east to Chestnut Hill Avenue, then south on Chestnut Hill Avenue and east on Beacon Street from Cleveland Circle to Washington Square, turning southeast to Brookline Village. After this was replaced by bus service in the 1920s (along with a rerouting), no revenue service used the tracks on Chestnut Hill Avenue, but they have remained for "B" Branch trains to access the Reservoir Carhouse at Cleveland Circle on the "C" Branch.
A turnback loop at Boston University Field was present from 1915 to January 14, 1962. It was used for service to special events as well as to short-turn some rush hour trains.
From 1942 to 1967, the route was known by the map number of 62. In 1967, the lines were given colors and the Green Line branches were lettered. The Commonwealth Avenue Line became the "B" Branch.
Read more about this topic: Green Line "B" Branch
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