Green Line B branch

Green Line B branch
An outbound train between Amory Street and Babcock Street in 2024
Overview
Locale	Boston, Massachusetts, United States
Termini	Government Center Boston College
Stations	23
Service
Type	Light rail
System	Green Line
Daily ridership	26,310 (weekday average boardings from surface stops only in 2010–2011)[1]
History
Opened	1896 (Kenmore–Packards Corner, Lake Street–Chestnut Hill Avenue) 1900 (Packards Corner–Chestnut Hill Avenue)
Technical
Character	Underground (Kenmore and eastward) Center median running (west of Kenmore)
Track gauge	4 ft 8+1⁄2 in (1,435 mm)
Electrification	600 V DC overhead
Route map Show interactive map Legend D and E branches Government Center Tremont Street subway Park Street Boylston Boylston Street subway Arlington Copley Copley Junction E branch Hynes Convention Center Kenmore D branch C branch Blandford Street portal Blandford Street Boston University East Boston University Central Amory Street Babcock Street A branch Packards Corner Fordham Road (closed 2004) Harvard Avenue Griggs Street/Long Avenue Allston Street Warren Street Summit Avenue (closed 2004) Washington Street Mount Hood Road (closed 2004) Sutherland Road Chiswick Road Chestnut Hill Avenue South Street Greycliff Road (closed 2004) Boston College Commonwealth Avenue This diagram: view talk edit Show route diagram map

The B branch, also called the Commonwealth Avenue branch or Boston College branch, is a branch of the MBTA Green Line light rail system which operates on Commonwealth Avenue west of downtown Boston, Massachusetts. One of four branches of the Green Line, the B branch runs from Boston College station down the median of Commonwealth Avenue to Blandford Street. There, it enters Blandford Street portal into Kenmore station, where it merges with the C and D branches. The combined services run into the Boylston Street subway and Tremont Street subway to downtown Boston. B branch service has terminated at Government Center since October 2021. Unlike the other branches, B branch service runs solely through the city limits of Boston. The Green Line Rivalry between Boston College and Boston University is named in reference to the B branch, which runs to both universities.

As of February 2023^[update], service operates on 8-minute headways at weekday peak hours and 8- to 12-minute headways at other times, using 9 to 15 trains (18 to 30 light rail vehicles).^[2]