Enormous cost increases on every single one of Crossrail's seven central London station contracts have been revealed. Cost hikes of up to 450% of the original target cost have also been reported on tunnelling contracts as well as significant increases in route-wide civil engineering and systems integration contracts. In total, public spending watchdog the National Audit Office (NAO) has revealed that costs on "36 main works contracts on the central section have increased, including contracts for tunnelling, civil engineering, station construction and fit-out, and implementing the systems required to operate the railway and stations".
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