Causeway Street Elevated
Encyclopedia
The Causeway Street Elevated was a part of the MBTA's Green Line
Green Line (MBTA)
The Green Line is a streetcar system run by the Massachusetts Bay Transportation Authority in the Boston, Massachusetts area of the United States. It is the oldest line of Boston's subway, which is known locally as the 'T'. The Green Line runs underground downtown and on the surface in outlying...

 in Boston, Massachusetts that ran roughly northwards from Haymarket
Haymarket (MBTA station)
Haymarket is a MBTA station on the Green and Orange lines, located at the corner of Congress and New Sudbury Street. Transfer between the Green and Orange Lines is possible here, although the adjacent North Station may be more convenient for some cross-platform transfers.Originally, the Orange...

, then ran westwards for a short distance around the Boston Garden
Boston Garden
The Boston Garden was an arena in Boston, Massachusetts, USA. Designed by boxing promoter Tex Rickard, who also built the third iteration of New York's Madison Square Garden, it opened on November 17, 1928 as "Boston Madison Square Garden" and outlived its original namesake by some 30 years...

 indoor sports venue's exterior through the Green Line's North Station stop, and resumed a north-westwards direction past North Station and the Garden, ending at Science Park
Science Park (MBTA station)
Science Park, signed as Science Park/West End, is a station on the MBTA Green Line and is located at the Boston end of the Old Charles River Dam at Leverett Circle, near the intersection of Nashua Street and Charles Street . The station is located on the elevated Lechmere Viaduct, which connects...

. As the name suggests, the Elevated ran above ground, until it was closed in June 2004, being replaced by underground tunnel as part of environmental remediation to compensate for increased air pollution caused by the Big Dig
Big Dig
The Central Artery/Tunnel Project , known unofficially as the Big Dig and as the Big Dug since completion, was a megaproject in Boston that rerouted the Central Artery , the chief highway through the heart of the city, into a 3.5-mile tunnel...

. Today, the Green Line emerges from the underground tunnel about halfway between North Station and Science Park, where it connects via ramp directly to the Lechmere Viaduct
Lechmere Viaduct
The Lechmere Viaduct is the last remaining elevated portion of the MBTA's Green Line in Boston, Massachusetts. Opened June 1, 1912, the Viaduct connects the Lechmere stop to the Science Park Station at Leverett Circle. Currently, the Green Line descends into a tunnel just east of Science Park...

, its only remaining elevated piece of track. The MBTA has no intention of running the remaining track on the viaduct underground.

The removal of the Elevated freed up land near the Big Dig
Big Dig
The Central Artery/Tunnel Project , known unofficially as the Big Dig and as the Big Dug since completion, was a megaproject in Boston that rerouted the Central Artery , the chief highway through the heart of the city, into a 3.5-mile tunnel...

and lowered noise levels associated with the trains' characteristic screech as they rounded sharp turns in the track.
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