Highland branch

What became the Highland branch was built in stages. The initial segment was the Boston and Worcester Railroad's Brookline branch, which opened on April 10, 1848. This line stretched 1.55 miles (2.49 km) from a junction with the Boston and Worcester main line south of Governor Square southwest to the current location of the Brookline Village station in Brookline, with an intermediate station at Longwood Avenue.[1][2] Construction costs were roughly $42,000.[3] Brookline had previously only been reachable by road (horsecar service on what is now Huntington Avenue did not begin until 1859), and the branch was quickly a success.[4][5]

Based on this success, the Charles River Branch Railroad was founded in 1849 to extend service west from Brookline.[5] Beginning in 1851, the railroad built 6.1 miles (9.8 km) from Brookline to Newton Upper Falls. This extension opened in November 1852, at a cost not exceeding $253,000.[6] The line was further extended to Great Plains (later part of Needham) the next year, and to Woonsocket, Rhode Island in 1863.[7] The Charles River Branch Railroad also constructed its own track parallel to the Brookline branch. From 1858, freight trains carrying gravel from Needham quarries to fill the Back Bay for development made up most of the traffic on the line.[7]

By the early 1870s the Boston and Worcester had become the Boston and Albany Railroad (B&A), itself destined to become part of the New York Central Railroad system. The tracks beyond Brookline, which now reached Woonsocket, Rhode Island, belonged to the New York and New England Railroad, a forerunner of the New York, New Haven and Hartford Railroad. New York and New England trains used the B&A's route via Brookline to reach Boston.[8]

A 1907 postcard of Waban station

A 1910 postcard of Beaconsfield station

The citizens of Newton were dissatisfied with their service to Boston and since the early 1870s and had pressured both the Boston and Albany and the New York and New England to improve service, without result. Among these proposals was for the NY&NE to sell part of its Woonsocket line to the B&A, which would then build west through Newton Highlands to Riverside, on its main line from Boston to Albany, New York. This would create a loop or "circuit" between Boston and Riverside. The founding of the Newton Circuit Railroad by a group of Newton citizens in 1882, with the stated goal of completing the circuit by building a 7-mile (11 km) line from Brookline to Riverside, prompted the two railroads to take action.[9]

In 1883 the New York and New England sold the line between Brookline and Newton Highlands to the B&A for $411,400.[10] The B&A completed the missing 3 miles (4.8 km) and opened the new branch on May 16, 1886.[11] To encourage commuter traffic the B&A offered reduced-fare commutation tickets.[12] The introduction of frequent service to Boston led a population boom in Newton.[13] Three new stations on the extension opened as they were completed: Waban on August 16, 1886; Woodland soon afterwards; and Eliot in December 1888.[14]

Between 1905–1907 the Boston and Albany undertook a project to remove grade crossings along the branch, following a similar project a decade earlier on the main line through Newton.[15] The line's elevation was lowered by as much as 10.5-foot (3.2 m) in some places in order to permit road traffic to cross overhead. Lower levels were added at Newton Highlands and Newton Centre to accommodate the depressed tracks. At this time service over the line was almost exclusively passenger, with just one scheduled freight train per day.[16] An infill station at Beaconsfield to serve magnate Henry Melville Whitney's Beaconsfield Hotel opened in 1907.[17]

The New York Central Railroad had bought the B&A in 1900 primarily for long-distance service.[15] After the New York Central electrified several suburban lines around New York City, the public asked for similar improvements around Boston. The New York Central studied third-rail electrification of the Highland branch and the main line as far as Framingham in 1911, but did not find it to be cost-effective.[18] The lines instead continued to use steam power until diesel locomotives were substituted around 1950.[19]

Trains which traveled from Boston to Riverside via the Highland branch returned via the main line, thus completing the "circuit". In 1904 a round trip took 1 hour and 15 minutes.[20] The B&A main line was quadruple-tracked between Boston and Riverside; tracks 3 and 4 were used by suburban trains.[21] After the Needham Cutoff opened in 1906, the New Haven rerouted most trains on the Charles River line via Forest Hills rather than the Highland branch to avoid congestion at the Cook Street junction. From 1911 to 1914, the New Haven operated "Needham Circuit" service operating via Needham and Newton Highlands.[22] In 1926, the Newton Lower Falls branch was rerouted to join the Highland branch south of Riverside. The branch ran with overhead electrification between Newton Lower Falls and Riverside until 1930, then with locomotives until 1957.[18]

By November 1912, the Highland branch had 30 daily round trips, plus several Needham trains operating via Newton Highlands. This frequency dropped by one-quarter by 1919 (with many Highland branch trains not completing the circuit on the main line), then stayed constant for two decades.[15] The B&A upgraded Brookline Junction to centralized traffic control (CTC) in 1932, improving the flow of traffic between the branch and the main line.[23] By 1950, the Highland branch saw just seven daily round trips.[15]

A PCC streetcar at Reservoir in 1967

The Massachusetts state legislature had first proposed replacing the conventional train service on the Highland branch with streetcars running from the Tremont Street Subway in 1926.[24][25] The next major round of planning in the mid-1940s suggested the same conversion, along with a branch to Needham.[26][27] The idea returned in the mid-1950s as a combination of factors, both general and specific, made the concept attractive. The commuter rail business had ceased to be profitable for most railroads in the United States. Causes included high structural costs of doing business, loss of demand outside of rush hour, and restrictive regulations.[28] The Boston-area railroads were not immune to these trends, and as the decade wore on sought to end or reduce their money-losing commuter operations.[29] In addition, the extension of the Massachusetts Turnpike over part of the B&A main line would reduce its capacity going forward.[24] By 1957, daily ridership was just 3,100 passengers.[30]

The Metropolitan Transit Authority (MTA) first proposed buying the Highland branch and rebuilding it as a light rail line in 1956, for a total estimated cost of $9 million.[31] The MTA was attracted to the project because it could extend rapid transit service quickly and cheaply.[27] The state legislature approved the purchase and a total expenditure of $9.2 million on June 20, 1957.[24][32] By the time the New York Central ended the seven inbound and nine outbound daily trains on May 31, 1958, daily patronage on the branch had fallen to 2,200 passengers.[33][34] The MTA bought the Highland branch from the Boston and Albany on June 24, 1958 for $600,000.[35] Even as the MTA took this action, the Boston and Maine Railroad was reducing service on its lines radiating out of North Station and the New York, New Haven and Hartford Railroad threatened to end all service on the Old Colony Railroad lines.[29]

A train at Eliot station in 2016

Construction on the new light rail line began on July 10, 1958. A new 1,150-foot (350 m)-long tunnel was built to connect with the existing Beacon Street Line tunnel west of Kenmore Square. Streetcar stations with automobile parking were built at all the former station sites; Riverside and Woodland were both relocated to the southeast. Additional construction included a yard at Riverside; a loop, busway, and connection with the existing yard at Reservoir; an additional station at Park Drive; and overhead electrification including a new substation at the South Boston power station.[32] The MTA reopened the branch as the Riverside Line on July 4, 1959. Total construction costs came to $8 million. Daily ridership was 25,000, ten times what the B&A trains had carried at the end.[33][36] The project was "ahead of schedule and under budget", and ridership exceeded projections. The faster acceleration of the electric streetcars permitted faster operation between downtown and Riverside (35 minutes versus 40 minutes) than the conventional trains they replaced.[37] While other government entities were subsidizing passenger operations around the United States, it was the only example at that time of a government entity taking on the entire cost of what had been a private operation,[38] and the only case of a commuter rail line converted to light rail.[39] By 1960, the line was estimated to reduce rush hour congestion in downtown Boston by seven percent.[30]

Though successful, the conversion was cheaply constructed, and further upgrades were soon needed. From June 1960 to January 1961, the MTA enlarged Riverside Yard and added a maintenance facility, upgraded the power infrastructure, and improved the signalling system.[40] In 1967, the MBTA (which had replaced the MTA in 1964) designated the line as the Green Line D branch as part of systemwide rebranding.[41] Ridership on the surface section of the D branch has remained relatively constant since 1959 - a 2010-2011 count found 24,632 weekday boardings.[42] Short sections of the Highland branch remained connection at both ends for freight service until the 1970s. The Lower Falls branch between Newton Lower Falls and Riverside was out of service after 1972, leaving just the short section at Riverside Yard; the branch was formally abandoned in 1976.[43]