1929 – First proposal for Second Avenue Subway introduced
1939 – 1945 Revised Second Avenue Subway proposal shelved as World War II begins
1972 – 1975 Federal funding granted to begin Second Avenue Subway but fiscal crisis in 1975 put project on hold
2004 – MTA proposes Second Avenue Subway line running from 125th Street to Lower Manhattan
2005 – November – New York State passes Transportation Bond Act, partially funding the construction of the line
2007 – April – Ceremonial groundbreaking at 96th Street Station
2007 – November – US Secretary of Transportation Mary Peters announces $1.3 billion of federal funding for Phase I of the project
2010 – May – Completion of Tunnel Boring Machine (TBM) launch box
2011 – March – With 65th Street tunnel complete, drilling begins for east tunnel
2011 – September – TMB completes its run to the 63rd Street Station
2013 – February – All controlled drill and blast excavation completed at 72nd Street Station
2013 – February – MTA Awards Contract to Build Second Avenue Subway Station Finishes at 72nd Street
2013 – June – MTA awards tenth and final contract to build Phase 1 of the project
2013 – July – 72nd Street muck house removal complete
2013 – July – Community Information Center opens at 1628 Second Avenue
2013 – November – Heavy Civil and Site Work completed at 96th Street
2013 – November – Blasting at 86th Street completed, marking the end of all blasting for Phase 1 of the project
2014 – January – Cavern Mining, Tunnels and Heavy Civil Work completed at 72nd Street
2014 – January – 69th Street muck house removal complete
2014 – February – Removal of worker "hoghouse" facility at 70th Street complete
2014 – April – 84th Street muck house removal complete
2014 – October – 86th Street muck house removal complete
2014 – December – Cavern Mining and Heavy Civil Work completed at 86th Street
2014 – December – Removal of worker "hoghouse" facility at 87th Street complete
2015 – May – Phase 1 is 82.3% complete
2016 – April – Track installation completed
2016 – July – All stations connected to permanent power
2016 – September – Track geometry car inspection conducted
2016 – October – New York City Transit begins pre-revenue service training; 63rd Street Plaza opens
2017 – January 1 – New Second Avenue Subway begins revenue service