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Topic: Highway 99 tunnel machine

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February 7, 2014 at 12:32 PM

Sand in the grease: Bertha’s main-bearing seals are damaged

Tunnel machine Bertha is showing damage to seals around its main bearing, an important piece that houses the axle that turns the world-record 57-foot, 670-ton cutterhead, the state Department of Transportation (DOT) said today. DOT didn’t speculate on how long the machine will be shut down, but said it will take perhaps two¬†weeks for contractors to…


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