Boxing Day shoppers and travellers face significant travel chaos as a section of Tube drivers stage a 24-hour walkout.
Thousands of train services have been cancelled even as members of the drivers' union, Aslef, start their strike in a long-running dispute over holiday pay. Though London Underground promised to operate as many services as possible, thousands of services have already been cancelled.
Millions of families have now been forced to cancel their rail plans and go for the road travel option instead. And this will add further to the chaos.
Boxing Day shoppers and football fans are among those who will be badly affected. However, Chelsea's Premier League match against Fulham at Stamford Bridge is going ahead as scheduled.
A London Underground statement said: "We will run as many Tube services as we can but some lines may have only a limited service, and some sections may be closed.
"There will be no London Overground services, and the only rail services operating will be on the Gatwick Express and some Southern services (from Victoria) and Stansted Express (from Tottenham Hale only). Heathrow Express will be running a replacement bus service."