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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