The work on the extensions started October 14, 1971 with Line 1 (Green Line) towards the east to reach the site where the Olympic Stadium was to be built and Autoroute 25 ( station) that could serve as a transfer point for visitors arriving from outside. The extensions were an opportunity to make improvements to the network, such as new trains, larger stations and even semi-automatic control. The first extension was completed in June 1976 just before the Olympics. Line 1 (Green Line) was later extended to the southwest to reach the suburbs of Verdun and LaSalle with the as the terminus station, named after the park and zoo. This station opened in September 1978.