"MBTA's Red Line" . . "Northwest Extension" . "Cambridge tunnel" . "Red Line Braintree Branch" . . . . . . . . . "Red Line" . . "Ashmont branch" . . "MBTA Red Line's Braintree Branch" . "until a dozen years later" . . "Cambridge Elevated" . . "Red Line Northwest Extension" . "Red line" . . "Cambridge\u2013Dorchester Tunnel" . . . "Red Line subway" . ":Red Line (MBTA)" . "Red Line (MBTA)#Braintree extension" . . . . . . . "red" . . . "1912-03-23" . "Red Line (MBTA)" . . "Braintree Branch" . . "nine years afterward" . . "Red Line (MBTA)" . . . . "Braintree" . "Red Line (MBTA)#History" . . . . "Pullman-Standard 01400/01491 ''Bluebird'' cars" . "Cambridge Tunnel" . "Red Lines" . "Red Line extension into Arlington" . "Red subway line" . "01500/01600 ''Silverbird'' cars" . "22" . "Cambridge subway (MBTA Red Line)" . "Red Line (MBTA)#South Shore line" . "Red Line (MBTA)#Dorchester Tunnel and extension" . . . . "Dorchester Tunnel" . "1912" . "Cambridge subway" . . . . "MBTA Red Line" . "a rapid transit extension" . "Braintree branch" . "Ashmont" . . . . . . . "Red" . "Red Line (MBTA)#Northwest extension" . . "Dorchester Extension" . .