Boston MTA The MTA was the primary public transportation authority for the Boston Metropolitan area , operating well up to 2077 . Their primary modes of infrastructure were Boston ' s subway network , as well as buses and a monorail network that ran under highways , sharing stations with the conventional subway trains . As evidenced by the lack of conventional subway carriages in the midst of the many wrecked monorail trains , the original subway system appears to have been in the process of being phased out in favor of a full - on monorail system . Background . Prior to 2077 , the Boston MTA operated several train lines within Downtown Boston , extending to Cambridge , Malden , Back Bay , Scollay Square , and other portions of the city . These lines included the Red , Blue , Orange and Green lines , and used similar rolling stock . An unidentified monorail line was operated by the system as well , evidenced by the broken monorail suspended from the bottom of an elevated highway and the monorail at the Mass Bay Medical Center . These subway / monorail lines operated up until mid - 2077 when they were closed due to shortages and rationing . Other than that , they were tasked with operating Boston ' s ground surface transport network , with a fleet of buses at the ready . Stations . Transit stations for the MTA can be found around the Commonwealth . Unlike the subway stations of the Capital Wasteland ' s DC Metro , none of these are interconnected , and function as singular underground spaces , due to blockages caused by wrecked trains and rubble . At least one Blue Line station has been converted into a bar , the Third Rail , located within the former Scollay Square Station in Goodneighbor . Another station , Park Street , was closed by the MTA and excavated into Vault 114 , where Vault - Tec would use the existing station infrastructure to build the vault to save costs . Most other stations also lie in disrepair , with the remains of trains and wreckage blocking the tunnels , and feral ghouls and super mutants , as well as raiders , taking residence in the concourses and platforms . Subway lines . Red Line . The Red Line connected travelers from Cambridge through Boston Common and into South Boston . The line interchanges with the Green Line at Park Street station . Orange Line . The Orange Line traveled from Roxbury to Malden , passing through Boston ' s Theater District in the process . It is the longest subway line operated by the MTA , traveling across several districts and connecting the southern outskirts of Boston to Malden , a city north of Boston . Blue Line . The Blue Line ran from the Boston Airport in East Boston to Postal Square in the Financial District . Scollay Square station and Post Office station are extremely close to each other . Green Line . The Green Line connected The Fens to the North End , stretching across the entirety of downtown Boston . The line interchanges with the Red Line at Park Street station . The line passed under the Boston Public Library and Boston Common . Monorail . The city ' s monorail system ran on a rail suspended under the city ' s elevated freeway system . The track runs from Quincy through the Theater District and Financial District , extending through Charlestown before abruptly ending at an interchange east of Lexington . A second track runs by Outpost Zimonja at the northern edges of The Commonwealth , heading southwest through the same Lexington interchange and eventually into the Glowing Sea . No stations can be found along the second track , though the wreck of a monorail can be found south of ArcJet Systems . The monorail initiative was said to be funded by Boston crime families , such as those led by Edward Winter and Sal Barsconi . Winter ' s response to a newspaper article about the ties of organized crime to the project was to threaten the reporter who wrote the article and order the murder of Safety Inspector Alice Lansky . Trains . Unlike the train cars of the DC Metro , the train cars of the MTA can still be entered , where the player can sometimes find loot alongside the skeletal remains of previous passengers . These trains have a streamlined tube - body shape with cab cars on both ends . Unlike the train cars of the DC Metro , the Boston MTA cars had no single pulling locomotive , utilizing electric motors on each car instead . The suspended monorail trains operated by the MTA also have the added advantage of running in both existing subway tunnels and beneath Boston ' s elevated Interstate Highway network .