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Blue Line (MBTA)
The Blue Line is a rapid transit line in the Greater Boston metropolitan area, one of four rapid transit lines operated by the Massachusetts Bay Transportation Authority (MBTA). It runs from Bowdoin station in downtown Boston under Boston Harbor to East Boston and Revere on the inner North Shore, where it terminates at Wonderland. The stop at Airport Station, by way of a free shuttle bus, is one of two rapid transit connections to Logan International Airport. In 1967, during a systemwide rebranding, the line was assigned the blue color because it passes under the Boston Harbor. With an end-to-end travel time of less than twenty minutes, the Blue Line is the shortest of Boston's heavy-rail lines and the only line to have both third rail and overhead catenary sections.
The East Boston Tunnel was built as a streetcar tunnel in 1904 with Howard A. Carson as chief engineer; after an extension to Bowdoin in 1916, it was converted to heavy rail metro rolling stock in 1924. In 1952 and 1954 the line was extended along the former route of the Boston, Revere Beach and Lynn Railroad, in a project intended to reach Lynn but ultimately cut short to Wonderland. Further extensions to Lynn and Charles/MGH downtown are long-planned but not yet funded. From approximately 1998–2011, the MBTA made most Blue Line stations fully accessible as part of a larger effort to accommodate 6-car trains on the line. As of 2018[update], the only station in service on the Blue Line which is not fully accessible is the downtown Boston terminus Bowdoin.
The East Boston Tunnel under Boston Harbor was the first North American subway tunnel to run beneath a body of water when it opened in 1904, and the second underwater vehicular tunnel of significant length built in the United States. The tunnel was constructed using a modified version of the Greathead Shield; 2,700 feet (820 m) of the 1 mile (1.6 km) tunnel is actually under water. The excavation took two-and-a-half years, and cost $3 million and the lives of four workmen.
Initially used as a streetcar tunnel, it ran from Maverick Square in East Boston to downtown Boston's Court Street station, with an intermediate stop at Devonshire (now State). Court Street had pedestrian access to Scollay Square station (now Government Center) but transfers to the East Boston Tunnel required an additional fare of 1 cent. In 1906, Atlantic Station (now Aquarium) was opened, with a connection to the Atlantic Avenue Elevated. Court Street proved to be a problematic terminus as its single-track design limited frequent service.
The Boston Transit Commission (BTC) began construction of a 0.5-mile (0.8 km) extension of the East Boston Tunnel on November 29, 1912. The extension ran from Scollay Square (where a new platform, Scollay Under, was constructed to replace Court Street station) to a new station and loop at Bowdoin Square. Tracks continued west under Cambridge Street to an incline at Joy Street, where streetcars could continue on surface tracks to Charles Street and the Longfellow Bridge to Cambridge.
Court Street station was abandoned on November 15, 1914, with service cut back to Devonshire. On March 13, 1916, service was extended to the new Scollay Under, with streetcars looping empty around the Bowdoin loop. Bowdoin station opened on March 18 along with the Joy Street Portal, which was used by a Central Square–Orient Heights through line as well as several Cambridge lines that terminated at Scollay Under. The total cost of the extension was $2.4 million.
The East Boston Tunnel was originally planned to be operated with high-floor metro rolling stock and connected to the then-planned Cambridge Elevated line. When that plan was dropped in 1903 due to a disagreement between the Boston Transit Commission and the BERy, the stations were built with low platforms. Large bi-loading streetcars (with high floors but capable of loading from low platforms), which incorporated many attributes from metro cars used on the Main Line Elevated, began use in 1905. However, neither these nor the large center-entrance cars introduced in 1917 (which were designed for multiple unit operation) could fully handle the crowds.
In 1921, the Boston Transit Department (BTD)—the successor to the BTC—began work at Maverick Square to convert the East Boston Tunnel to high-floor metro trains. The next year, the BTD board approved the construction of high-level platforms at the four downtown stations. The Maverick Square incline was replaced with Maverick station, which provided cross-platform transfers between tunnel trains and surface streetcars.
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Blue Line (MBTA)
The Blue Line is a rapid transit line in the Greater Boston metropolitan area, one of four rapid transit lines operated by the Massachusetts Bay Transportation Authority (MBTA). It runs from Bowdoin station in downtown Boston under Boston Harbor to East Boston and Revere on the inner North Shore, where it terminates at Wonderland. The stop at Airport Station, by way of a free shuttle bus, is one of two rapid transit connections to Logan International Airport. In 1967, during a systemwide rebranding, the line was assigned the blue color because it passes under the Boston Harbor. With an end-to-end travel time of less than twenty minutes, the Blue Line is the shortest of Boston's heavy-rail lines and the only line to have both third rail and overhead catenary sections.
The East Boston Tunnel was built as a streetcar tunnel in 1904 with Howard A. Carson as chief engineer; after an extension to Bowdoin in 1916, it was converted to heavy rail metro rolling stock in 1924. In 1952 and 1954 the line was extended along the former route of the Boston, Revere Beach and Lynn Railroad, in a project intended to reach Lynn but ultimately cut short to Wonderland. Further extensions to Lynn and Charles/MGH downtown are long-planned but not yet funded. From approximately 1998–2011, the MBTA made most Blue Line stations fully accessible as part of a larger effort to accommodate 6-car trains on the line. As of 2018[update], the only station in service on the Blue Line which is not fully accessible is the downtown Boston terminus Bowdoin.
The East Boston Tunnel under Boston Harbor was the first North American subway tunnel to run beneath a body of water when it opened in 1904, and the second underwater vehicular tunnel of significant length built in the United States. The tunnel was constructed using a modified version of the Greathead Shield; 2,700 feet (820 m) of the 1 mile (1.6 km) tunnel is actually under water. The excavation took two-and-a-half years, and cost $3 million and the lives of four workmen.
Initially used as a streetcar tunnel, it ran from Maverick Square in East Boston to downtown Boston's Court Street station, with an intermediate stop at Devonshire (now State). Court Street had pedestrian access to Scollay Square station (now Government Center) but transfers to the East Boston Tunnel required an additional fare of 1 cent. In 1906, Atlantic Station (now Aquarium) was opened, with a connection to the Atlantic Avenue Elevated. Court Street proved to be a problematic terminus as its single-track design limited frequent service.
The Boston Transit Commission (BTC) began construction of a 0.5-mile (0.8 km) extension of the East Boston Tunnel on November 29, 1912. The extension ran from Scollay Square (where a new platform, Scollay Under, was constructed to replace Court Street station) to a new station and loop at Bowdoin Square. Tracks continued west under Cambridge Street to an incline at Joy Street, where streetcars could continue on surface tracks to Charles Street and the Longfellow Bridge to Cambridge.
Court Street station was abandoned on November 15, 1914, with service cut back to Devonshire. On March 13, 1916, service was extended to the new Scollay Under, with streetcars looping empty around the Bowdoin loop. Bowdoin station opened on March 18 along with the Joy Street Portal, which was used by a Central Square–Orient Heights through line as well as several Cambridge lines that terminated at Scollay Under. The total cost of the extension was $2.4 million.
The East Boston Tunnel was originally planned to be operated with high-floor metro rolling stock and connected to the then-planned Cambridge Elevated line. When that plan was dropped in 1903 due to a disagreement between the Boston Transit Commission and the BERy, the stations were built with low platforms. Large bi-loading streetcars (with high floors but capable of loading from low platforms), which incorporated many attributes from metro cars used on the Main Line Elevated, began use in 1905. However, neither these nor the large center-entrance cars introduced in 1917 (which were designed for multiple unit operation) could fully handle the crowds.
In 1921, the Boston Transit Department (BTD)—the successor to the BTC—began work at Maverick Square to convert the East Boston Tunnel to high-floor metro trains. The next year, the BTD board approved the construction of high-level platforms at the four downtown stations. The Maverick Square incline was replaced with Maverick station, which provided cross-platform transfers between tunnel trains and surface streetcars.