![]() Assessing radio and data communication systems for effective delivery of audio and visual announcements to customers and automatic vehicle location data to the Transportation Management Center.Verifying automatic train control system guides the automatic movement of light rail vehicles properly through tunnels.Conducting safety drills and developing contingency plans in the event of a passenger evacuation or first responders needing access to an incident in the tunnel.Testing emergency ventilation fans for adequate tunnel air supply and extraction.Inspecting fire sprinklers installed in tunnels to ensure they respond to fire alarm activation.Completing major excavation for Yerba Buena/Moscone Station and Union Square/Market Street Station and pivoting work toward interior construction.Installing new track interchange at 4th and King and 4th Street surface tracks.Building stations, surface tracks, and systems.Excavating tunnels by tunnel boring machines beneath SF.Building launch box for tunnel boring machines on 4th between Harrison and Bryant.Project Implementation Construction Phase The project cost $1.9 billion, provided by the Federal Transit Administration, the State of California, the Metropolitan Transportation Commission, the San Francisco County Transportation Authority and the City and County of San Francisco. Tunnels over a mile long under the streets are as deep as 120 feet in some areas. ![]() ![]() In 2013, work began to add 1.7 miles to the T Third, with four new stations in SoMa, Union Square and Chinatown. It connects neighborhoods in Mission Bay, Bayview, Hunter’s Point and Visitacion Valley. After six years of construction, the first part of the T Third opened on 3rd Street in 2007. Planning for Central Subway began in the late 1980s to provide more transit on 3rd Street and in Chinatown. ![]()
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