Crossrail’s opening has been delayed yet again until 2021 and could cost as much as £650m.
The announcement made on Friday morning means the cost of the Elizabeth Line could reach £18.25bn and £2.35bn more than the original cost of £15.9bn.
The project’s chief executive Mark Wild said, “Crossrail Ltd will need further time to complete software development for the signalling and train systems and the safety approvals process for the railway.”
Wild added, “The Elizabeth line will open as soon as practically possible in 2021.
“We will provide Londoners with further certainty about when the Elizabeth line will open early in 2020.
“Our detailed cost forecasts continue to show that the project’s costs will increase due to programme risks and uncertainties.
“The latest projections indicate a range of between £400m to £650m more than the revised funding agreed by the mayor, government and Transport for London (TfL) in December 2018.”