Type Light rail Stations 8 Daily ridership 4,637 | Termini Ashmont
Mattapan Services 1 | |
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Locale Boston, Massachusetts (Dorchester to Mattapan) via Milton, Massachusetts | ||
The Ashmont–Mattapan High Speed Line, also known as the "M-Line", is a partially grade-separated light rail line which forms part of the MBTA's Red Line rapid transit line. The line, which runs through Boston and Milton, Massachusetts, opened on August 26, 1929 as a conversion of a former commuter rail line and exclusively uses historic PCC streetcars for rolling stock. Passengers must transfer at Ashmont to access the rest of the Red Line, which uses heavy rail metro rolling stock.
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The term "high speed line" is a historic vestigial designation, distinguishing the exclusive and largely grade-separated right-of-way at a time when most trolleys ran down streets shared with automobiles. The 2.6 miles (4.2 km) route is used only by streetcars and has just two public grade crossings. All stations have low platforms, but all except Valley Road have been retrofitted with wheelchair lifts or wooden ramps for handicapped accessibility.
Route
The Ashmont–Mattapan Line begins and ends within the city of Boston, but most of the southern half of its route is in the northern part of the neighboring town of Milton. It follows the right-of-way of two former Old Colony Railroad branches which had commuter rail service until the 1920s. Much of the route parallels the Neponset River, crossing it twice. The right-of-way is owned by the MBTA and has only two at-grade crossings on its 2.6 miles (4.2 km) route.
Between Cedar Grove and Butler stations, the line runs through the center of the Cedar Grove Cemetery.
Commuter rail lines
The Dorchester and Milton Branch Railroad opened in December 1847 from Neponset on the Old Colony main line to Mattapan station in Dorchester via Milton Mills (later Milton Lower Mills, then simply Milton). The line was immediately led by the Old Colony as its Milton Branch (Neponset Branch). The Old Colony built the Shawmut Branch Railroad from Harrison Square on the main line to Milton Lower Mills via Peabody Square in 1872. Most Mattapan passenger service switched to use the new branch east of Milton, as it ran through dense urban neighborhoods rather than swamps. The Old Colony Railroad and its branches were acquired by the New York, New Haven and Hartford Railroad in 1893.
When the Boston Elevated Railway (BERy) was first constructing its rapid transit Cambridge-Dorchester Line in the early 1910s, plans called for the line to be extended south from Andrew to Codman Square via Edward Everett Square, Columbia Square, and Mount Bowdoin. The route would have paralleled the New Haven's Shawmut Branch and Midland Division. By the end of that decade, however, passenger traffic on both New Haven-owned lines had been decimated by the BERy's network of electrified streetcar lines, which connected to rapid transit trains at Forest Hills, Egleston, Dudley Square, and Andrew. Around 1920, BERy reached an agreement with the New Haven and the Boston Transit Commission to pursue the Dorchester Circuit Plan. Under that plan, a bidirectional rapid transit loop would run south from Andrew along the Old Colony main line, take over the Shawmut Branch and Milton Branch to Mattapan, cut over to the Midland Division on a tunnel, and return to Andrew via the Midland Division right-of-way and another tunnel segment.
Rapid transit conversion
Although the Midland Branch served more populated areas, real estate deals along the Shawmut Branch stood to benefit key state politicians. Construction of a rapid transit extension to Mattapan via the Shawmut Branch was approved on March 23, 1923.
Steam trains were discontinued in 1927 and the line was closed for two years while it was modified for streetcars. There was a debate at that time whether or not to continue subway trains from Boston to Ashmont onwards to Mattapan, but the cost of full-scale subway service was apparently too high for the Boston Elevated Railway which then operated it. The line opened from Ashmont to Milton on August 26, 1929, and from Milton to Mattapan on December 21, 1929.
On March 18, 1968, the Neponset River flooded the line at Milton station. Restoration work began at 6:00 am on March 21 as the waters receded; service was resumed by 4:30 pm.
The line's longest shutdown started June 24, 2006 while the Ashmont and Mattapan stations were renovated. Service was restored on December 22, 2007. Several of the stations have been renovated for better accessibility and modernization; all stations are now wheelchair-accessible except Valley Road, which is down a grade from the nearest road with no room for a ramp.
Ashmont-Mattapan Line stations had red signage up until the line's closure for renovation. When the line reopened in 2007, green signage was used at stations to indicate the line's light rail character, contrary to the MBTA's practice of color-coding signage to match the line. However, in 2008 the green signage was replaced with red signage to match the line's color.
Collisions
On March 20, 1979, three trolleys collided between Central Avenue and Valley Road stations. The first two trolleys had stopped to avoid a police car, which had become stuck on the tracks while the officer was investigating teenagers drinking near the line. A third trolley was unable to stop in time while approaching around a blind curve; it slammed into the first two trolleys, causing a number of injuries but no deaths.
Using funding from the American Recovery and Reinvestment Act of 2009, the MBTA has been conducting a pilot test of technology similar to a collision avoidance system in an automobile, using radar and increasingly fast beeping to warn train operators of obstacles ahead. Like positive train control, it would stop the train if the driver did not take action to avoid an impending collision. If successful, the system would be considered for deployment on the Green Line, where multiple collisions have occurred in recent years.
On November 26, 2014, an out-of-service car collided with an in-service car near Cedar Grove. Seven people were injured.
Rolling stock
The rolling stock consists of rebuilt PCC streetcars, which were formerly part of a fleet shared with the Green Line. The historic rolling stock is retained largely because the line, built for 1920s streetcars, would have to be substantially rebuilt to accommodate the heavier modern cars used on the Green Line. Unlike most rail lines running old streetcars, the line is an integral part of the modern transit system rather than a heritage streetcar tourist attraction.
The current set of PCC cars are "Wartime" PCCs, built by Pullman-Standard in 1945-46. They have been in continuous revenue service in Boston since their construction, although PCC cars were not assigned to the Ashmont-Mattapan Line until 1955. The current fleet was rebuilt as part of a systemwide PCC rebuild program in 1978-83, and again in 1999-2005. During the latter rebuild, the cars were repainted from their former Green Line paint scheme to a brighter orange and cream design, similar to their original coloring. The cars also carry a unique geographic MBTA logo, reminiscent of the old Metropolitan Transit Authority map logo found on the cars between 1948 and 1955.
On several occasions, the MBTA has proposed to replace the PCC streetcars either with newer trolleys or with buses, and has met with substantial community opposition on each occasion. The FY2017-FY2021 Capital Investment Plan, approved by the MassDOT board in June 2016, allocates $9 million to the line including $3.7 million for maintaining the PCC cars. The plan also allocates $5 million for "PCC Car Replacement-Alternative Service".
"Snowzilla"
To clear the line of snow, the MBTA maintains a jet engine powered snowblower, officially the Portec RMC Hurricane Jet Snow Blower, model RP-3, dubbed "Snowzilla" by MBTA spokesman Joe Pesaturo. Snowzilla weighs 26,000 pounds, measures 8 by 12 by 27 feet, and is powered by a Westinghouse J34 turbojet engine. It uses approximately 500 gallons of jet fuel per line clearing run. Other T lines simply run regular trains to clear the tracks of snow, but the older cars on this line would short out if used for that purpose.