It was revealed earlier this year the project's budget had risen to £57 billion but was originally planned to cost £37.5 billion.
Rail chiefs have demanded that the upcoming HS2 trains be redesigned to include extra doors, according to reports.
The development is the latest blow to taxpayers in a long-running saga of expenses, despite then prime minister Rishi Sunak cancelling the construction of its northern leg between Birmingham and Manchester last year to cut costs. The latest design change will add on extra doors to each carriage of the line's 225mph trains which will shorten the time the trains spend on platforms waiting for passengers to alight and board.
William Barter, a rail planning consultant, suggested the redesign would cost tens of millions of pounds. HS2 Ltd said in a statement: 'Our trains are in the detailed design phase with HS2's contract joint venture Hitachi–Alstom prior to the start of production at sites across the Midlands and northern England.
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