Weird & curious
Central Subway
The Central Subway is a Muni Metro light rail tunnel in San Francisco, California, United States. It runs between Chinatown station in Chinatown and a portal in South of Market (SoMa), with intermediate stops at Union Square/Market Street station in Union Square and Yerba Buena/Moscone station in SoMa. A surface portion runs through SoMa to connect to the previously existing T Third Street line at 4th and King station.
Why it's on the map
Preparations for tunnel boring began on June 12, 2012, with the start of excavation for the TBM launch box on Fourth Street between Bryant and Harrison.
"Mom Chung" was delivered to San Francisco in April and May 2013, and in late July 2013, "Mom Chung" began digging the tunnel for southbound T Third trains.
Source: Wikipedia / Wikidata
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