San Francisco’s Central Subway is 98% complete (video)

San Francisco Municipal Transportation Agency is now testing Muni trains on the new Central Subway system. This project started in 2010 and has met with a number of delays and cost overruns.
Underground, crews have been hard at work, digging a trench in Stockton Street, a station beneath Union Square, and the deepest dig in the city: 12-stories underground for the station in Chinatown.
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