Several major train routes in and out of London will be shut down over the Christmas period causing disruption for thousands.
Around 25,000 workers will be carrying out engineering works, upgrades and improvements to rail routes across the capital, National Rail said.
It is one of the capital's biggest ever sets of engineering works over Christmas with the majority of routes into Paddington cancelled or heavily reduced, disruption to Southern Rail routes, no Gatwick Express services from Victoria and no trains from Liverpool Street to parts of Essex.
The shutdown will begin at 9pm on Christmas Eve, with no trains running on any line on Christmas Day and limited services on Boxing Day.
Here is everything you need to know about travelling in and out of London over Christmas.
Great Western Railway
No GWR trains are running from London Paddington from December 23 to December 26 and on December 30 for work on Crossrail.
Between December 27-29 and on December 31, GWR trains will run but less frequently. Other services will run on an amended timetable.
Southeastern
Around half of the platforms at Victoria Station will be closed over Christmas because of engineering works at Battersea, so the line will be running a reduced service for much of the period.
Like all other routes, there are no trains running on Christmas Day.
South Western Railway
Passengers on SWR are set to face travel misery on December 22 and 31 with strike action also planned on both days.
Engineering work is being carried out at London Waterloo, meaning trains will be running less frequently and on a different timetable for most of Christmas, with most trains running to and from Clapham Junction instead.
Additional services will be operating between Waterloo and Clapham Junction on December 23, 24, 27 and 28 to help ferry people around. No trains are running on December 25 and 26.
Bosses have announced that extra trains will be running during the early hours of January 1 and will be running slightly later to help those travelling home from New Year's celebrations.
Southern Rail
The engineering works at Battersea will affect Southern services throughout the period with trains not running between London Victoria and Clapham Junction from Sunday 23 until January 1.
Services will instead be diverted to London Bridge. Rail bosses have warned passengers that Clapham Junction will be extremely busy because of this. A few trains are running on Boxing Day.
Greater Anglia
Major engineering work is taking place throughout the whole period, affecting services between Liverpool Street and Essex.
No trains are running between Liverpool Street and Ingatestone or Billericay from Sunday, December 23 until Wednesday, January 2 and are replaced by buses. Passengers can travel on the London Underground from Newbury Park.
Hourly services between Liverpool Street and Stansted Airport and Cambridge are running on December 24, 27, 28 and January 1.
Heathrow Express
There will be no service from December 23 to December 26, and on December 30, because Paddington station is closed for engineering work.
Over the rest of the festive season, the line will have trains every 30 minutes with some amended departure times.
Services return to normal on New Year's Day.
Gatwick Express
Engineering work near Victoria means services on the Gatwick airport shuttle will not run for the entire Christmas period.
Alternative routes are running from London Blackfriars and London Bridge to Gatwick. On Boxing Day, a limited service will run from London Bridge.
