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Red Blue Connector
The Red Blue Connector is a proposed construction project to extend the Massachusetts Bay Transportation Authority (MBTA) Blue Line west to connect to the Red Line, which are the only two MBTA subway lines that lack a direct connection. It would extend the Blue Line 0.4 mi (0.64 km) west beyond the current terminus at Bowdoin station to a new terminus at Charles/MGH station, eliminating the former as a result. The project is suggested to relieve pressure on Downtown Boston stations, overcrowding on the Green Line (which is currently the most convenient way to transfer between the two lines), and to connect communities unlinked by public transit, including Cambridge and East Boston. An underground connection between the Blue Line and the Red Line has been considered since the 1920s. However, the connector idea did not gain serious traction until the early 1970s. Progress of any kind on the proposed project was mostly stagnant until 1991, when the Commonwealth of Massac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rapid Transit
Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separation, grade separated rapid transit line below ground surface through a tunnel can be regionally called a subway, tube, metro or underground. They are sometimes grade-separated on elevated railways, in which case some are referred to as el trains – short for "elevated" – or skytrains. Rapid transit systems are usually electric railway, electric railways, that unlike buses or trams operate on an exclusive right-of-way (transportation), right-of-way, which cannot be accessed by pedestrians or other vehicles. Modern services on rapid transit systems are provided on designated lines between metro station, stations typically using electric multiple units on railway tracks. Some systems use rubber-tyred metro, guided rubber tires, magnetic levitation (''maglev''), or monorail. The stations typica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Big Dig
The Big Dig was a megaproject in Boston that rerouted the then elevated Central Artery of Interstate 93 that cut across Boston into the O'Neill Tunnel and built the Ted Williams Tunnel to extend Massachusetts Turnpike, Interstate 90 to Logan International Airport. Those two projects were the origin of the official name, the Central Artery/Tunnel Project (CA/T Project). The project constructed the Leonard P. Zakim Bunker Hill Memorial Bridge, Zakim Bunker Hill Bridge over the Charles River, created the Rose Fitzgerald Kennedy Greenway, Rose Kennedy Greenway in the space vacated by the previous I-93 elevated roadway, and funded more than a dozen projects to improve the region's public transportation system. Planning for the project began in 1982. Construction work was carried out between 1991 and 2006. The project concluded in December 2007. The project's general contractor was Bechtel, with Parsons Brinckerhoff as the engineers, who worked as a consortium, both overseen by the Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tremont Street Subway
The Tremont Street subway in Boston's MBTA subway system is the oldest subway tunnel in North America and the third-oldest still in use worldwide to exclusively use electric traction (after the City and South London Railway in 1890, and Line 1 (Budapest Metro), the Budapest Metro's Line 1 in 1896), opening on September 1, 1897. It was originally built, under the supervision of Howard Adams Carson, Howard A. Carson as chief engineer, to get streetcar lines off the traffic-clogged streets, instead of as a true rapid transit line. It now forms the central part of the Green Line (MBTA), Green Line, connecting Boylston (MBTA station), Boylston Street to Park Street station (MBTA), Park Street and Government Center (MBTA station), Government Center stations. History The tunnel originally served five closely spaced stations: Boylston station, Boylston, Park Street, Government Center station (MBTA), Scollay Square, Adams Square station, Adams Square, and Haymarket station (MBTA), Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paid Area
In rail transport, the paid area is a dedicated "inner" zone in a railway station or metro station, accessible via turnstiles or other barriers, to get into which, visitors or passengers require a valid ticket, checked smartcard or a pass. A system using paid areas is often called fare control. Passengers are allowed to enter or exit only through a faregate. A paid area usually exists in rapid transit railway stations for separating the train platform from the station exit, ensuring a passenger has paid or prepaid before reaching the railway platform and using any transport service. Such design requires a well-organized railway station layout. In some systems, paid areas are named differently - for example, on railways in the United Kingdom they are called compulsory ticket areas. The paid area is similar in concept to the airside at an airport. However, in most cases entrance to the paid area requires only a valid ticket or transit pass. The exception is in certain cases o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunnel Boring Machine
A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. TBMs are an alternative to drilling and blasting methods and "hand mining", allowing more rapid excavation through hard rock, wet or dry soil, or sand (although each requires specialized TBM technologies). TBM-bored tunnel cross-sections extend up to (through June 2023). TBM tunnels are typically circular in cross-section, but may also be square or rectangular, or U- or horseshoe-shaped. Much narrower tunnels are typically bored using trenchless construction methods or horizontal directional drilling rather than by TBMs. TBMs limit disturbance to the surrounding ground and produce a smooth tunnel wall, which reduces the cost of lining the tunnel; it also allows for tunneling in urban areas. Large TBMs are expensive and challenging to construct and transport, fixed costs which become less significant for longer tunnels. Tunneling speeds generally decline as tunnel size in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Austrian Tunneling Method
The new Austrian tunneling method (NATM), also known as the sequential excavation method (SEM) or sprayed concrete lining method (SCL), is a method of modern tunnel design and construction employing sophisticated monitoring to optimize various wall reinforcement techniques based on the type of rock encountered as tunneling progresses. This technique first gained attention in the 1960s based on the work of Ladislaus von Rabcewicz, Leopold Müller, and Franz Pacher between 1957 and 1965 in Austria. The name NATM was intended to distinguish it from earlier methods, with its economic advantage of employing inherent geological strength available in the surrounding rock mass to stabilize the tunnel wherever possible rather than reinforcing the entire tunnel. NATM/SEM is generally thought to have helped revolutionise the modern tunneling industry. Many modern tunnels have used this excavation technique. The Sequential Excavation Method is very cost effective, even in karst conditions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cut-and-cover
A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two Portal (architecture), portals common at each end, though there may be access and ventilation openings at various points along the length. A Pipeline transport, pipeline differs significantly from a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic, for rail transport, rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sanitary sewer, sewers or aqueduct (watercourse), aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harvard Square (MBTA Station)
Harvard station is a rapid transit and bus transfer station in Cambridge, Massachusetts. Located at Harvard Square, it serves the MBTA's Red Line subway system as well as MBTA buses. Harvard averaged 18,528 entries each weekday in FY2019, making it the third-busiest MBTA station after and . Harvard station is located directly beneath Harvard Square, a transportation, business, and cultural focal point in Cambridge. The Red Line rail platforms lie underneath Massachusetts Avenue just north of the center of the square. Many connecting surface transit routes are served by the Harvard bus tunnel, which runs on the west side of the station. The primary station entrance leads to a central atrium fare lobby under Harvard Square; there is also a secondary fare lobby for the Red Line toward the north end of the station, with entrances at Church Street and opposite it, near Harvard's Johnston Gate; and an unpaid entrance to the bus tunnel at Brattle Square. Station layout Harvard st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passenger Train
A passenger train is a train used to transport people along a railroad line, as opposed to a freight train that carries goods. These trains may consist of unpowered passenger railroad cars (also known as coaches or carriages) push-pull train, hauled by one or more locomotives, or may be self-propelled; self propelled passenger trains are known as multiple units or railcars. Passenger trains stop at Train station, stations or depots, where passengers may board and disembark. In most cases, passenger trains operate on a fixed Public transport timetable, schedule and have priority over freight trains. Car design and the general safety of passenger trains have dramatically evolved over time, making travel by rail remarkably safe. Some passenger trains, both long-distance and short-distance, use Bilevel car, bi-level (double-decker) cars to carry more passengers per train. Sleeper trains include sleeping cars with beds. Passenger trains hauled by locomotives are more expensive to op ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kendall/MIT (MBTA Station)
Kendall/MIT station (signed as Kendall) is an underground rapid transit station in Cambridge, Massachusetts. It is served by the MBTA Red Line. Located at the intersection of Main Street and Broadway, it is named for the primary areas it serves - the Kendall Square business district and the Massachusetts Institute of Technology (MIT). Opened in March 1912 as part of the original Cambridge subway, Kendall/MIT has two side platforms serving the line's two tracks. The ''Kendall Band'', a public art installation of hand-operated musical sculptures, is located between the tracks in the station with controls located on the platforms. Kendall/MIT station is accessible. With 17,018 weekday boardings by a FY2019 count, Kendall/MIT has the fourth highest ridership among MBTA subway stations. Station design Kendall/MIT station has two underground side platforms serving the two tracks of the Red Line, which runs approximately east–west under Main Street. The main headhouses are located ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longfellow Bridge
The Longfellow Bridge is a steel rib arch bridge spanning the Charles River to connect Boston's Beacon Hill, Boston, Massachusetts, Beacon Hill neighborhood with the Kendall Square area of Cambridge, Massachusetts. The bridge carries Massachusetts Route 3, the Massachusetts Bay Transportation Authority, MBTA Red Line (MBTA), Red Line, bicycle, and pedestrian traffic. The structure was originally known as the Cambridge Bridge, and a predecessor structure was known as the West Boston Bridge; Boston also continued to use "West Boston Bridge" officially for the new bridge. The bridge is also known to locals as the "Salt-and-Pepper Bridge" due to Salt and pepper shakers, the shape of its central towers. The bridge falls under the jurisdiction and oversight of the Massachusetts Department of Transportation (MassDOT). The bridge carries approximately 28,600 cars and 90,000 mass-transit passengers every weekday. A portion of the MBTA subway's elevated Charles/MGH station lies at the ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bowdoin (MBTA Station)
Bowdoin station ( ) is a Massachusetts Bay Transportation Authority (MBTA) rapid transit station in Bowdoin Square in Boston, Massachusetts. The station is the downtown terminus of the Blue Line, part of the MBTA subway system. It has a single wedge-shaped island platform located inside a balloon loop. Bowdoin is the only Blue Line station that is not accessible. Bowdoin opened in 1916 as part of an extension of the East Boston Tunnel, serving as the terminal for streetcar lines from East Boston. The line was converted to use high-floor trains in 1924, with raised platforms constructed at the stations. The station was modernized in 1968, with a new brutalist headhouse designed by Josep Lluís Sert. Bowdoin was closed for two periods in the early 1980s due to budget cuts; it was open for limited hours on weekdays only until 2014, when it returned to full-time service during the reconstruction of nearby Government Center station. The proposed Red Blue Connector would extend ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
