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Máquina Tuneladora. Estas grandes máquinas se mueven esencialmente en fábricas que cortan la roca, excavan los residuos de la parte trasera e instalan el blindaje de hormigón, a la vez que se mueve a lo largo como un gusano, normalmente sobre raíles.

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Business end of a tunnel boring machine used in Seattle [4320X3240]

Digging an Enormous Tunnel Under Downtown Seattle

To carve a 57.4-foot-diameter viaduct tunnel UNDER Seattle, engineers have ordered an $80 million tunnel-boring machine (TBM) from Japan with more than 700 cutting tools on its face.

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A small tunnel boring machine in New York City ready to build the Second Avenue subway line [1024x768]

Rear of the Ohashi tunnel tunnel boring machine, 2008 by Ken Ohyama [10,052 × 6,212] x-post -r-HI_Res

Tokyo subway tunnel boring machine [1280 x 960]

Rotary Snow Plough Train - not the classic cow-catcher style, this plough more resembles the head of a Tunnel Boring machine. (Skagway, Alaska)

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Tunnel boring machine being used for the new metro line in LA [1152x1536] (x-post -r-LosAngles)