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Photos of Tunnel Boring Machines in San Francisco

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The new Central Subway in San Francisco will be approx. 1.6 miles long and there will be stations in Chinatown, Union Square, Moscone Center/Yerba Buena and a station at 4th and Brannan.

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Tunnel Boring Machines or TBM’s

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Pics of Tunnel Boring Machine aka TBM’s. They will be used to create the Central Muni Tunnel/Subway. The piece in the photo is called Big Alma. Naming them is good luck. More information can be found here.
http://centralsubwaysf.com/tbm-name
They also have Twitter handles. @BigAlmatheTBM and @MomChungtheTBM.

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