A multibillion plan to bring Crossrail to south-west London is being drawn up and will be discussed this week. 

A second phase of the rail network would connect Wimbledon to Seven Sisters, in north-east London, via Tooting, Clapham Junction, and a number of central London stops.

It is understood Transport for London and Network Rail have been actively considering the plans – named Crossrail 2 - which will be unveiled tomorrow night (Tuesday) by London First, an organisation which lobbies the Government on behalf of the capital.

The scheme, expected to cost at least £15bn, is based on plans first drawn up in the 1970s to build a cross-London line from Chelsea to Hackney.

From Wimbledon, the train would travel through an underground tunnel to Tooting Broadway, Clapham Junction, Chelsea, Victoria, Tottenham Court Road, Euston, Angel, Dalston Junction, Seven Sisters and Epping.

It is understood Wimbledon not to be the terminus, and the line would extend overground further into south-west London or Surrey.

Richard Tracey, assembly member for Merton and Wandsworth, said Crossrail 2 would be “a further great step forward in transport connectivity for south London.”

He added: “Wandsworth Council in particular have been pushing for this new line to pass through Clapham Junction, in addition to the Northern Line Nine Elms extension.

“There have been a number of alternatives to provide new trains south of the river.

“With the recent announcement that the [First Capital Connect] Wimbledon loop line will remain as it is, and with new air-conditioned trains on the District Lines, Wimbledon is benefitting from significant investment over the next few years.”

A source at Merton Council said Crossrail 2 coming to Wimbledon has ended any hopes of a new primary school being built in a council-owned car park in Queen’s Road.

The source said: “The Department of Transport have told the council they need the site when the tunnel is built.

“In the next decade Wimbledon is going to be a massive commercial centre but I’m afraid it will also be a massive building side while the new tunnel and station are built.”

It is believed construction work would have to begin after 2018, when the first Crossrail project is completed.

Crossrail 1, which costs a total of £14.8bn, passes through 37 stations across 73 miles from Heathrow and Maidenhead in the west to Shenfield and Abbey Wood in the east.