Both the airport and the train service have called on travellers to allow extra time for their journeys, as the Piccadilly line was functioning as normal but could be busier than usual.
“We advise passengers to allow extra time for their journey and apologise for any inconvenience caused,” Heathrow Express said in a tweet.
It comes as thousands of passengers were left stranded in cold, dark trains for hours after a train collided with a foreign object outside of Paddington station, causing power up to Acton Main Line to be switched off.
