Question: The MBTA line located at the intersection of Massachusetts Ave and Huntington Avenue passes through what part of Boston? 
Context: Four Corners/Geneva Ave is a passenger rail station on the MBTA Commuter Rail's Fairmount Line located in the Mount Bowdoin section of Dorchester, Boston.  The new station was being built as part of the Fairmount Line Improvement Project, which includes four new stations as well as infrastructure upgrades.  It has two full-length high-level platforms with walkways connecting them to Washington Street and Geneva Avenue.  Four Corners/Geneva Ave opened on July 1, 2013, along with Newmarket. The Green Line is a light rail system run by the Massachusetts Bay Transportation Authority (MBTA) in the Boston, Massachusetts, metropolitan area.  It is the oldest Boston subway line, and with tunnel sections dating from 1897, the oldest in America.  It runs underground through downtown Boston, and on the surface on several radial boulevards and into inner suburbs.  With a daily weekday ridership of over 232,000 in 2015, it is the most heavily used light rail system in the country.  The line was assigned the green color in 1967 during a systemwide rebranding because several branches pass through sections of the Emerald Necklace of Boston. Mechanics Hall (Boston, Massachusetts) was a building and community institution on Huntington Avenue at West Newton Street, from 1881 to 1959.  Commissioned by the Massachusetts Charitable Mechanic Association, it was built by the noted architect William Gibbons Preston.  The building was located between the Boston and Albany railroad yards and Huntington avenue.  It was razed for the Prudential Center urban renewal project of the early 1960s.  The site is on the north side of Huntington Avenue, and since 1941 has been served by Prudential Station ("nee" Mechanics Hall Station) of the MBTA Green Line "E" Branch. Belmont Center is a commuter rail station on the MBTA Commuter Rail Fitchburg Line located in Belmont, Massachusetts.  It is situated at the intersection of Common Street, Concord Avenue, and Leonard Street adjacent to Belmont's town center.  It is one of two railroad stations located in Belmont, the other being Waverley station located in Waverley Square.  To avoid any potential confusion, the station is labeled as "Belmont" on MBTA maps. Heath Street (announced as Heath Street/VA Medical Center) is a tram stop and terminus of the MBTA Green Line "E" Branch, located at the intersection of South Huntington Avenue and Heath Street on the border between the Mission Hill and Jamaica Plain neighborhood line of Boston, Massachusetts.  The station is accessible when served by the MBTA's newer low-floor trolley cars and buses. The Nashville Terminal Subdivision is a railroad line owned by CSX Transportation in the U.S. State of Tennessee.  The Subdivision is broken up into 5 sections all in Nashville, Tennessee.  The northern part of the Terminal is in Madison, Tennessee at milepost 000/0BA 174 on the southern end of the Ex-L&N Mainline Subdivision at Monfort.  Disptach for the Mainline Sub is known as "LD" which is part of the Cincinnati Division.  From here in Madison begins the double track that stays for another 22 miles south to Brentwood, Tennessee.  At milepost 000/0BA/00H 176.6, the famous Johnny Cash "Amqui" location where the Ex-L&N Evansville, Indiana line, the Henderson Subdivision meets with the Terminal.  Dispatch for the Henderson Sub is known as "SA" and operates on AAR58.  There are two crossings near each other, Williams Ave and Nesbitt Lane at Amqui.  From here the Terminal goes south about 2 miles to the Nashville National Cemetery to the first major location, known as Ekin, 000179, where there is a cross over track from number 1 to number 2 track (left to right track).  There is also the first EDD (Defect Detector) at 000179.1.  Few more miles southward, the next major location appears.  At 000181.0, Maplewood is a major location for the Terminal.  From here the regular Terminal goes south to swap crews at Kayne Ave, and the right side, Radnor Cutoff, detours the city and gives yard departures and arrivals direct access to and from Radnor yard to cities like Louisville and Chicago.  The Cutoff runs from Maplewood to Shelby Park double track.  From Shebly the track converges into one to pass the historic Shelby bridge, then it opens back to double track.  From there, the cutoff hits the Intermediates at 0BA187.0 known as Chicken Pike.  The Radnor Cutoff carries the L&N mainline classification of "0BA" but meets the main at the same milepost from the Terminal.  At Chicken Pike, trains are staged to await arrival to Radnor yard.  Once they get clearance, speed is decreased to 15, and at 0BA188.1 the EDD (Defect Detector) sounds for departures and arrivals.  This location is known as North Radnor.  The right track diverging from the #2 is known as A-1, it is for departure trains to Chattanooga and Atlanta.  The left track which goes west from the #1 is known as A-2, and serves as a departure track to Memphis, and if the cutoff is out of service, all northbound departures.  The interesting piece of Maplewood is the crossovers that are there to move trains from the Cutoff to the Main.  Both lines remain double track for a while.  The main runs south for 2 more miles until the Intermediate signals at 000183.0.  Commonly trains will stop before Delmas Ave when Kayne Ave is at capacity and await dispatch permission before moving south.  From here, the main continues south until the CR Cumberland River Swingbridge, where the main converges into a single track shortly to cross the bridge.  At this point, trains had been running at track speed of around 40.  From the drawbridge into town, speed is reduced to around 10.  After the bridge is passed, the main returns to double track in downtown.  On the #1 track about a half a mile south, another connecting track is present.  This is the Wye track that connects the main with the Bruceton side, while rarely used for mainline trains, locals and river jobs use it.  The location is known as 8th Avenue or 8th Avenue Wye.  The main then runs down to Kayne Ave, the central hotbed of all Nashville thru traffic.  The Memphis, Tennessee Ex-L&N Bruceton Subdivision meets with the Terminal.  The Bruceton Sub begins at Church Street at 00N0.0.  The line then runs single track until 00N0.7 "11th Avenue" where it turns into double track and also meets the aforementioned, Wye track.  The Bruceton line then goes southwest a while to the next signals, at "Shops".  Now speed has been increased.  The line is still double track until "Sellars", where speed is increased to 40 and jurisdiction transferred to the SD Dispatcher.  For a short time, 4 main tracks are present and an additional fifth track for switchers and yard movements.  The tracks from left to right in Kayne Ave are as follows: 100, 99, 98, 12, 3.  The Kayne Ave yard is also here in this area, which houses some frieght and some switcher engines.  The tracks to the old shed are covered and removed.  The Union Station is not an active station, but a historic hotel.  Crew change usually occurs at the "walkway" which is under the Demombreun St bridge by the Kayne Ave Tower.  This is also where the Ex-NC&StL Chattanooga Subdivision begins.  Then tracks run south to Fogg St/South End where things get complicated.  At milepost 000/0BA/00J187 the 98 track merges into the 12 track, making for 3 tracks now.  There is a crossover from 99 to 12, also a crossover from 12 to 3.  About 2/10ths of a mile down the 99 merges into the 12 track reducing the tracks back to the regular double.  About 4/10ths of a mile down the line from Fogg St, 000187.4, Oak St, is a crossover track from #2 to #1 (the track names are no longer 3 and 12, but are back to regular names).  When trains use this crossover northbound, such as Memphis bound trains from the A-2 line, they refer to it as "Long Lead".  And now, the Terminal splits into two parts.  The right side turns into a single track shortly, and will become the Chattanooga Subdivision, and the left side runs south to Brentwood.  The right track runs single shortly until double track for a while.  This begins part of the Chattanooga Sub or J-Line.  The #2 meets with the A-2 connection track at 00J2.2 known as A-2.  Speed is now increased to 40.  Commonly northbounds will stage at 4th Ave on the #1 to await clearance.  Now about a mile down the #1 meets the A-1 connection line.  At 00J3.6 known as A-1.  Further down the double track ends at Glencliff (00J4.9).  Now it runs single for three miles until it hits Danley, which has the D Line connection track, which is an arrival track for incoming Radnor trains from the J Line.  At Danley, the Terminal ends but the same dispatcher handles traffic, "SC".  At Oak Street, our main terminal line goes south two miles to 000189.0 known as Criaghead or Vine Hill.  There is a crossover here from #1 to #2 track.  And there is also a connection/delivery track to the Nashville and Eastern Railroad which connects the Tennessee Central Railroad Museum to a major railroad.  Trains sometimes stop on the #2 before Craighead if they are waiting to enter Radnor yard.  Sometimes trains wait on the #1 at the Berry Road crossing if they await arrival to Kayne Ave. At this point, speed has been increased to 30 from 10.  Moving south, the line hits Radnor Yard at 000192.  The #2 track meets the E-Line arrival track which most Memphis trains and locals use.  The B-Line which meets the #1 track is used for departures out of the C yard and local jobs.  At Mayton, 000192.3, the B line meets the #1 track, and there is a crossover track from #2 to #1.  Speed is now at 40.  2 miles south, at 000194.0, South Radnor, the next intersection is present.  This is where the Radnor A yard meets the main.  There is a single departure/arrival track that meets the #2 track along with a crossover from #1 to #2 track.  Commonly, the #2 track south of the signals is used to halt trains.  This location is known as TVA, because of the power station that is adjacent.  From here the Terminal runs about 2.5 miles south until we hit the southern tip.  The tracks converge onto one single main, at 000/0BA196.6 known as Brentwood.  Speed is increased to 50 and jurisdiction to the S.E. dispatcher.  The right track is the main, S&NA North, while the left track is the Nashville Subdivision which runs to Columbia and exchanges freight with the TSRR.  The Nashville Terminal Subdivision is one of the busiest locations on the CSX network, and one of the most important. Huntington Avenue is a secondary thoroughfare in the city of Boston, Massachusetts, beginning at Copley Square, and continuing west through the Back Bay, Fenway, Longwood, and Mission Hill neighborhoods.  Huntington Avenue is signed as Route 9.  A section of Huntington Avenue has been officially designated the Avenue of the Arts by the city of Boston. Riverway is a light rail station on the MBTA Green Line "E" Branch, located at the intersection of South Huntington Avenue and Huntington Avenue in Boston, Massachusetts, slightly east of Brookline Village.  The station is named for the Riverway parkway which runs on an overpass just to the west. Northeastern University (signed as Northeastern) is a surface-level trolley stop on the MBTA Green Line.  It is located in a dedicated median along Huntington Avenue in Boston, between Opera Place and Forsyth Street, and is adjacent to the Krentzman Quad on the campus of Northeastern University.  It is the first surface-level stop going outbound along the Green Line "E" Branch; trolleys rise from a portal located between Opera Place and Gainsborough Street and continue along the surface down Huntington Avenue towards Mission Hill. Symphony is an underground light rail stop in Boston, Massachusetts on the "E" branch of the MBTA Green Line.  It is located at the intersection of Massachusetts Avenue and Huntington Avenue.  Symphony is the outermost underground station on the "E" branch; after leaving Symphony, outbound trolleys emerge onto the surface and continue down the median of Huntington Avenue.  Symphony station is named after the nearby Symphony Hall.
Answer: Emerald Necklace of Boston