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The Green Line, operated by the MBTA, is a light rail system with an underground section in Boston. To replace the PCC cars that had been used for many years, the US Standard Light Rail Vehicle (USSLRV) manufactured by Boeing Vertol was introduced in 1976. However, problems frequently occurred in various parts such as the door, air conditioning ...
The MBTA's light rail vehicle types follow the nomenclature of the Boston Elevated Railway, which operated five series of cars. The numbering resumed with the unbuilt Type 6 prototype in the late 1960s, and continued with the custom-designed Type 7 and Type 8 of the 1980s and 1990s respectively.
The LRV design is a one-way eight-axle motorized car consisting of three articulated cars, which are connected to each other by the joint and the cover. [9] Each light rail vehicle has three roof-mounted air-conditioning units. In total, there are nine air-conditioning units in a three-car train set.
The SLRV is a double-ended high-floor articulated light rail vehicle 71 ft (22 m) long overall (over the anticlimbers), in the same range as many heavy rail vehicles both at the time and now, but noticeably shorter than many other modern LRVs such as the at-minimum-81-foot (25 m) Siemens S70 and S700 commonly found today, which rides on three ...
All of the concepts proposed a longer vehicle than the current Type 8/9 cars, with lengths ranging from 100 to 131 ft (30 to 40 m). The MBTA's final concept for the new cars was a 114-foot (35 m) articulated low-floor light rail vehicle made up of 7 segments, riding on 4 trucks, and equipped with 5 sliding doors on each side. [5]: 30–35
Semi-permanent couplers are present in the ends of each light rail vehicle except the driving cab section of the MC car. The 1200 class employs a regenerative and electronically controlled pneumatic braking system manufactured by Knorr-Bremse. [1] The resistors are mounted on the roof for backup regenerative brakes. [5]
In the United States, "light railway" generally refers to an urban or interurban rail system, which historically would correspond to a streetcar network. The distinct term light rail was introduced in the 1970s to describe a form of urban rail public transportation that has a lower capacity and lower speed than a heavy rail or metro system, but which generally operates in exclusive rights-of ...
As of March 2020, there are a total of 53 operational light rail-type lines and systems (noting that some cities, such as Philadelphia, Portland, San Francisco and Seattle, have more than one light rail system) that offer regular year-round transit service in the United States: 26 modern light rail systems, [8] 14 modern streetcar systems, and ...