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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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