Morning rush-hour commuters are facing serious disruption with several Tube lines either partially suspended or delayed.
As of 6.40am, the Piccadilly line was suspended between Northfields and Heathrow due to the late finish to engineering works in the Hounslow West area, with severe delays between Cockfosters and Northfields westbound.
There were also severe delays on the Circle and Metropolitan lines.
Meanwhile, the Elizabeth line was suspended between West Drayton and Reading due to a signal failure.
National Rail warned trains running between London Paddington and Heathrow Terminals / Reading may be cancelled, delayed by up to 20 minutes or revised.
Follow the latest updates below.
Part suspension and severe delays on four Tube lines and Elizabeth line
06:55 , Megan Howe
Four Tube lines are suffering severe delays this morning ahead of rush hour, Tfl has reported.
The Circle, Metropolitan and Piccadilly lines are all facing severe delays due to train cancellations, an earlier fire alert and a late finishing of engineering works.
The Elizabeth line is part suspended between West Drayton and Reading while engineers work to fix a signal failure.
