London Underground has revealed the full extent of the misery facing commuters as another attempt is made to get this week's tube strike called off.
Underground bosses have published their "best case scenario" masterplan to keep trains running if the 48-hour strike over ticket office closures goes ahead.
Meanwhile, managers and union officials will return to the conciliation service ACAS this morning in another bid to settle the dispute before tomorrow night's walkout.
But after days of stalemate, a breakthrough looks increasingly unlikely.
Transport for London hopes to use an army of back-room staff - so-called Ambassadors - to try to keep stations open.
All Underground lines will be effected by the strike and the impact on some services will be severe.
Commuters can expect long queues and overcrowding as fewer trains call at fewer stations - and that is if they are lucky!
The Circle and Waterloo & City lines will be suspended and most stations in Zone 1 on the District, Jubilee and Piccadilly lines will be closed.
Services will begin to wind down from 9pm tomorrow night and will not return to normal until Friday morning.
The dispute is over the proposed closure of all tube ticket offices with the loss of 950 jobs.
London Underground says there will be no compulsory redundancies, no stations will be unmanned and 200 new jobs will be created when night services begin in 2015.