 decided to build to Lynn as a rapid transit line, and construction began in October 1948.The first part of the Revere Extension opened to Orient Heights on January 5, 1952, with intermediate stations at Airport Station and Day Square.Day Square station was built on a new section of right-of-way, which connected the former Eastern Railroad's East Boston Branch (used by the extension as far as Airport Station) with the BRB&L at Harbor View.