Editing Red Line (MBTA) (section)

===South Shore line===
On July 28, 1965, the MBTA signed an agreement with the [[New Haven Railroad]] to purchase {{convert|11|miles}} of the former Old Colony mainline from [[Fort Point Channel]] to South Braintree in order to construct a new rapid transit line along the corridor. The line was expected to be completed within two years. The agreement also provided for the MBTA to subsidize commuter service on the railroad's remaining commuter rail lines for $1.2 million annually.<ref name=netransit /><ref>{{cite news |url=https://www.newspapers.com/clip/38297699/the_boston_globe/ |title=MBTA Buys Old Colony Line For a South Shore Express |newspaper=Boston Globe |date=July 29, 1965 |first=Robert |last=Carr |via=Newspapers.com}}</ref> Original plans called for the South Shore line to be largely independent of the existing Red Line, with either a northern terminus at the surface level at South Station or a tunnel leading to a stub-end terminal between [[Post Office Square (Boston)|Post Office Square]] and State Street.<ref>{{cite news |url=https://www.newspapers.com/clip/38297773/the_boston_globe/ |title=MBTA Plans Downtown Tunnel |newspaper=Boston Globe |page=4 |date=November 20, 1965 |via=Newspapers.com}}{{open access}}</ref> However, it was later decided to have the line be a new southern branch of the Red Line.

The first section of the South Shore line, under construction since 1966, opened on September 1, 1971, branching from the original Red Line at a [[flying junction]] north of Columbia (now [[JFK/UMass (MBTA station)|JFK/UMass]]). It ran along the west side of the Old Colony rail right-of-way (which has since been reduced to one track), crossing to the east side north of Savin Hill. The northernmost station was [[North Quincy (MBTA station)|North Quincy]], with others at [[Wollaston (MBTA station)|Wollaston]] and [[Quincy Center (MBTA station)|Quincy Center]]. Service began alternating between Ashmont and Quincy. Ashmont service operated with 1400-series cars, while the Quincy branch only had 1500- and 1600-series cars because they had cab signaling.<ref name="netransit" />

In December 1969, the MBTA purchased [[Penn Central]]'s Dover Street Yards for $7 million.<ref name=chronicle>{{cite book |url=http://web.mit.edu/cron/project/uncertainty/Dowd_Data/Baum_Snow/boston-history.txt |title=A Chronicle of the Boston Transit System |year=1992 |publisher=Massachusetts Bay Transportation Authority |via=MIT |last=Sanborn |first=George M. |access-date=2016-01-19 |archive-date=2019-04-16 |archive-url=https://web.archive.org/web/20190416214442/http://web.mit.edu/cron/project/uncertainty/Dowd_Data/Baum_Snow/boston-history.txt |url-status=dead }}</ref><ref name=rollsign1972>{{cite magazine |magazine=Rollsign |title=MBTA South Bay Maintenance Center Contract |volume=9 |issue=8/9 |date=August–September 1972 |publisher=Boston Street Railway Association}} Via [https://catalog.archives.gov/id/63793905 Tremont Street Subway NHL documentation].</ref> The site was used for the South Bay Maintenance Center (later Cabot Yard), which included Red Line shops (to replace Eliot Yard) and an adjacent bus garage. A $7.8 million construction contract was awarded in 1972, with groundbreaking on September 16.<ref name=chronicle /><ref name=rollsign1972 /> The facility was dedicated on June 24, 1974; on December 28, Bartlett Street garage in Roxbury was closed.<ref name=chronicle />

Three southbound trains collided inside the Beacon Hill tunnel on August 1, 1975, injuring 132 passengers.<ref>{{cite book |last=Clarke |first=Bradley H. |title=The Boston Rapid Transit Album |publisher=Boston Street Railway Association |year=1981 |location=Cambridge, Mass. |page=16}}</ref><ref>{{cite news |url=https://www.newspapers.com/clip/43833787/the_boston_globe/ |title=132 hurt in rush-hour crash of 3 MBTA trains |newspaper=Boston Globe |date=August 2, 1975 |page=1 |first1=Charles E. |last1=Claffey |first2=David |last2=Richwine |via=Newspapers.com}} {{open access}}</ref>

====Braintree extension====
[[File:Quincy Adams garage facing northeast, January 2016.JPG|thumb|left|Quincy Adams (pictured) and Braintree stations include massive parking garages to accommodate suburban commuters.]]
Beyond Quincy Center, the '''Braintree extension''' runs southward to [[Braintree (MBTA station)|Braintree]], opened on March 22, 1980, via an intermediate stop at [[Quincy Adams (MBTA station)|Quincy Adams]] which opened on September 10, 1983 due to delays.<ref name="netransit" /> The extension was part of the massive 1965 extension plan, although it was delayed due to questions over station siting in Braintree.<ref>{{cite news |url=https://www.newspapers.com/clip/38302568/the_boston_globe/ |title=MBTA to Unveil Master Plan Soon For 75-mph Service to Far Points |newspaper=Boston Globe |page=48 |date=November 7, 1965 |first=Robert |last=Hanron |via=Newspapers.com}}{{open access}}</ref> The [[Boston Transportation Planning Review]], published in 1969, proposed North Braintree and South Braintree stations following the [[Quincy Center (MBTA station)|Quincy Center]] station.

Several outlying sections of the MBTA subway system, including Quincy Adams and Braintree, originally charged a double fare to account for the additional costs of running service far from downtown. Passengers paid two fares to enter at the stations, and an [[exit fare]] when leaving the station. Double fares on the Braintree extension, the last on the system, were discontinued in 2007 as part of a wider fare restructuring.<ref>{{cite web |url=http://www.mbta.com/fares_and_passes/charlie/?id=10132 |archive-url=https://web.archive.org/web/20070930014518/http://www.mbta.com/fares_and_passes/charlie/?id=10132 |archive-date=September 30, 2007 |publisher=Massachusetts Bay Transportation Authority |title=Frequently Asked Questions on the Fare Restructuring and Increase}}</ref>