Crossrail is to receive an emergency £825m loan to help complete construction and avoid the project being indefinitely mothballed and grinding to a halt. 

The mayor of London, Transport for London (TfL), the Department for Transport (DfT) and HM Treasury have confirmed and agreed the funding and financing package for the final phase of the project, meaning that work on the railway can continue at pace.  

Crossrail Ltd announced in August that the Elizabeth line had been delayed again until 2022 and that they would require an additional £1.1bn funding to complete.

And London Transport commissioner Andy Byford last month warned the DfT that if an additional funding deal was not secured soon “we will have no option but to mothball the project and to seek alternative governance for its eventual completion".

The shortfall will initially be covered by the Greater London Authority (GLA) borrowing up to £825m from the DfT which will be given by GLA to TfL as a grant. The GLA will repay this loan from Business Rate Supplement (BRS) and Mayoral Community Infrastructure Levy (MCIL) revenues.

The new Elizabeth line, running through the heart of London, will now open more than four years late and cost almost £4bn than originally planned. The giant infrastructure scheme had originally planned to cost £14.8bn, with services planned to start operating in December 2018.

Mayor of London Sadiq Khan said: “Securing this financing package enables us to press full steam ahead with getting the central section of the Elizabeth line open as soon as possible. The government have insisted London must pay the shortfall – despite the overwhelming majority of the tax income that will result from Crossrail going to the Treasury. This is another example of London supporting the country way over and above the help we get from this government. 

“I do not want this project to be stalled so it is vital that we dig deep to get the railway up and running. I will continue to monitor progress closely and do everything I can to minimise costs - helping ensure London and beyond can enjoy its many benefits sooner rather than later.”  

Andy Byford, London's Transport Commissioner, said: “I have been very clear that it is my priority to get the railway open as soon as possible and all those working on the Crossrail project are focused on that too. Confirming this financing is an essential step in ensuring the team can fully concentrate on safely delivering the Elizabeth line, which is so vital for boosting rail capacity and supporting the economy.”

Mark Wild, chief executive, Crossrail Ltd, said: “Delivery of the Elizabeth line is now in its complex final stages. Good progress continues to be made with completing the remaining infrastructure works so that we begin intensive operational testing, known as Trial Running, at the earliest opportunity in 2021. Many of the stations are now nearing completion and we will shortly commence an enabling phase for Trial Running which allows testing in the tunnels to be undertaken with an increased number of trains, further helping to build operational reliability. We are doing everything possible to deliver the Elizabeth line as safely and quickly as we can.”

Governance of Crossrail transferred directly to TfL in October. A special purpose committee of the TfL Board, the Elizabeth Line Committee, provides high-level oversight of the project. The project remains jointly sponsored by TfL and the DfT, and an independent DfT representative will attend the committee meetings.  

When fully open, the Elizabeth line will increase central London's rail capacity by 10%, able to carry more than half a million passengers per day and will support new journeys through central London out to Essex and Berkshire. The new railway is expected to support thousands of new homes and new jobs and will boost the UK economy by £42bn.