ALL trains to London Heathrow were this morning cancelled leaving passengers stranded for hours.

A burst water pipe caused major flooding and signalling issues across the Heathrow Express and the Elizabeth Line.

NINTCHDBPICT001084862425The Elizabeth Line ground to a standstill this morning after a burst pipe Credit: Alamy NINTCHDBPICT001084862427Passengers have been stranded for hours as all trains to and from London were cancelled Credit: Alamy

The lines have now reopened but there will be disruption for the rest of the day.

A spokesperson said: “Following flooding caused by a burst water main near Heathrow Airport affecting the signalling system, all lines running to / from Heathrow Terminals have now reopened.”

They added that “major disruption” will continue to until just before 3pm.

The Piccadilly line is also suspended for planned engineering works.

One flier said the chaos had thrown the UK’s biggest airport into “full meltdown” as hundreds of passengers try to cram onto buses.

Some passengers had been waiting more than two hours at the internal bus station.

A Heathrow spokesman previously said: “There are currently no rail services operating to and from Heathrow.

“If you are travelling to the airport, please allow extra time and consider bus or coach options. We apologise for any inconvenience caused.”