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A 3,000t twin portal concrete bridge was slid into place below the West Country main line near Chippenham during a 72 hour rail closure which started at 10pm on Christmas Eve. Main contractor Hochtief used hydraulic jacks linked via Macalloy bars to move the structure nearly 40m to permanent foundations constructed in tunnels driven through the existing embankment. The main slide, which began late on Christmas Day, was preceded by a successful 3.5m trial slide the Friday before. After ...

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