The £41bn mega-project that would add a new station to the London Underground map

A proposed £41 billion train line would add a new station to the London Underground map. Crossrail 2 is a suspended proposal for a hybrid commuter rail and rapid transit route in South East England.

With nine stations in Surrey and three in Hertfordshire, it would provide a new north-south rail link across Greater London via Victoria and King's Cross St Pancras. According to Sadiq Khan in 2019, the project's cost has been estimated at £41.3 billion. The proposal came after National Rail projected overcrowding in suburbs and tourist destinations less well-served by the Underground, leading it to call for more new lines. Cross-London line proposals also gained more importance when Euston was named the terminus of the planned High Speed 2 rail line, which would connect London to Birmingham. Crossrail 2would operate 30 trains per hour (in each direction) across the core section between Dalston and Wimbledon. In London, only one new station would be built, King's Road Chelsea, between Parsons Green and Sloane Square.

From Dalston, it would go north to Broxbourne in Hertfordshire, and from Wimbledon, it would go south to Epsom and Shepperton in Surrey. An eastern line to Hackney Downs was also proposed.

When first proposed in 2013, the hope was for construction to start around 2023, with the new line opening in the early 2030s. A 2013 consultation by TfL revealed broad support for the plans, with 96% of respondents supporting or strongly supporting them.

The greatest level of opposition came from the residents of Kensington and Chelsea, with nearly 20% of respondents either opposed or strongly opposed the scheme.

Boris Johnson, then-Mayor of London, said: "The key question now is not whether Crossrail 2 should happen, but how quickly we can get it built."

In 2014, he called for the future line to be called the "Churchill line", after World War 2 Prime Minister, Winston Churchill. As Prime Minister, Johnson restated his backing for the project at an event to mark the opening of the Elizabeth Line in May 2022.

The scheme was shelved in November 2020, as part of the conditions for emergency COVID-19 funding between the Government and Transport for London (TfL).

The line would have been the fourth major rail project in the capital since 2000, following the East London line (the Overground) extensions, the Thameslink Programme, and Crossrail 1 (the Elizabeth Line).