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| Re: MBTA Boston: Blue Line's new cars (677167) | |||
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Re: MBTA Boston: Blue Line's new cars |
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Posted by Gerry6309 on Fri Sep 5 19:29:21 2008, in response to Re: MBTA Boston: Blue Line's new cars, posted by Dand124 on Sun Aug 24 19:42:54 2008. The decision to use overhead power was made based on how exposed the line is and how likely it was to experience third rail icing. The pantograph was chosen over trolley poles for ease of changeover, and that in torn dictated continued 3rd rail operation west of Maverick, due to the shape of the harbor tunnel arch.The decision was ratified when the South Shore extension was not only equipped with 3rd rail, but with extra wide 3rd rail, forming the biggest ice shelf north of Antartica. Thousands of kilowatts of 3rd rail heaters later the line sti;; produces winter fireworks, and don't touch the carbody in the station if the lights are out! (Boston uses "Elevated Style" 3rd rail as some work cars still use "Lindall" shoes. The 01400 cars were wired for pantographs as delivered in anticipation of that power source on the South Shore. The 01500s and 01600s were ordered after the decision was made and were not. Wire on the East Boston Libe begins at Maverick where the changeover was traditionally made. In the 1990s 3rd rail was extended to Airport to simplefy shuttle operations, and the changeover is now made there. |
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