Millions of passengers face travel chaos today because of a strike by London Underground workers which is set to cripple Tube services.
Members of the RMT and TSSA unions walked out at 9pm last night for 48 hours in protest at the closure of ticket offices, with the loss of several hundred jobs.
Services were hit last night immediately after the strike started, and disruption is expected to be widespread today.
Train passengers were also warned of problems because of a return to the wet and windy weather which has devastated travel across the UK.
Southeastern trains said the forecast weather, after the wettest January for a century, presented a risk of further flooding, landslips and falling trees.
As a result, Network Rail has put in place a 40mph speed restriction across parts of the Southeastern network today.
Picket lines will be mounted across the capital today outside Tube stations, many of which will be closed.
Politicians have condemned the industrial action, with Conservatives again calling for changes to employment laws covering the numbers voting for strikes in a ballot.
London's mayor Boris Johnson called the strike "pointless" and urged the unions to call it off and return to talks.
Bob Crow and Manuel Cortes, leaders of the RMT and TSSA unions, accused the mayor of refusing to meet them to discuss the ticket office closures.
As the row raged, commuters and other passengers faced travel misery until services return to normal on Friday.
Another 48 hour strike is planned next week.
Business groups warned the strikes will cost London's economy tens of millions of pounds.