The Elizabeth Line was originally due to open in 2018, putting the project approximately three years behind schedule.
The new east-west railway, which has already had three bail-outs, was due to launch in December.
TFL have confirmed that the opening of Crossrail may be delayed. The project has agreed another bailout after its costs ballooned, with backers providing an additional £1.4 billion to complete the line.
The Elizabeth line had originally been due to open this month.
The rail scheme has been put back by nine months.
Brits 'are being priced out of getting to work', say campaigners.
Fixing the housing market is complex. The prize for doing so will be electoral as well as social and economic.
Historic cemetery will have to be excavated when work begins.