Commuters are facing travel chaos in on the last Friday before Christmas with delays and cancellations hitting several main transport routes.
The Metropolitan Line, the London Overground and DLR are all part-suspended this morning, while those travelling on the Gatwick Express, Southern Rail and Thameslink are also facing delays.
The issues have been sparked by flooding, signal failures, faulty trains and electrical issues. This is compounded by another day of strike action on South Western Railway.
On the Metropolitan line, a signal failure at Wembley Park means there is currently no service southbound between that station and Aldgate.
Northbound, trains are not running between Aldgate and Harrow-on-the-Hill. There are severe delays on the rest of the line in both directions.
An issue with the overhead power lines at Willesden Junction has also crippled London Overground services across north and west London.
No trains are running from Stratford to either Richmond or Clapham Junction, while services are also down from Gospel Oak to Barking.
A TfL spokeman said: “We are sorry for the problems with the service on the Metropolitan line this morning. We are investing £5.4bn in modernising the trains, track and signalling on these lines, in one of the most important upgrades in the history of the Tube network.
"The introduction of new signalling and removal of older infrastructure will result in greater capacity and improved frequency as well as better journey times, reliability and customer information.
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"We are working around the clock to minimise the impact of the introduction of the new signalling system and appreciate the continued patience of our customers while we work to deliver long term improvements to their service.”
A faulty train on the DLR has also stopped services running between Stratford and Bow Church.
It came as Southern Rail warned passengers not to travel between Brighton and Gatwick Airport due to flooding on the lines.
