Crossrail project in London marks construction milestone

The massive Crossrail tunnel project in London is celebrating another milestone as the tunnel-boring machine named Mary breaks into the station box at Woolwich in London, and another TBM, Sophia, will start the second part of its journey. In the past three months, Mary has excavated approximately 121,254 tons of material and set in place 811 concrete liner rings. Crossrail is the largest construction project in Europe.

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