Frustrated holidaymakers are facing delays of more than four hours after a train became stuck in the Eurotunnel.

Bosses have had to close part of the track, which connects Folkestone with the continent.

Travellers venting their anger on social media said a train had been brought to a halt under the Channel en route to Calais.

Martyn S said on X: “So apparently there is a Eurotunnel train stuck in a tunnel and service is constrained to a single lane running.

“Boarding lanes are full, the car park is full and so there are no admissions through check-in.”

He added: “Why is there no detailed information being posted here or online?

“I’m three cars back from the check-in barrier and there’s no information flowing anywhere.

“Truly appalling.”

Chip Cain said: “I’ve been stuck in the Channel for more than an hour.

“No air, no updates. Thanks for ruining our vacation.”

Meanwhile, a passenger on the stranded service, Gaby Koppel, wrote at about 9.30am: “I'm on the first train out of London heading for Paris.

“We've been stationary in the tunnel for two hours now, and have been told that we'll be going again in 15 minutes.”

The track is now running again at a reduced speed.

Traffic reporting specialists Inrix says passengers are facing delays of about four and a half hours.

Queues have also begun to spill onto the slip road of the M20.

A spokesperson for operator Eurostar said on X: “Train 9080 had a technical issue this morning.

“This train is now running at reduced speed to Calais where passengers will be transferred to another Eurostar train to continue their journey to Paris.

“Thank you for your understanding and our apologies for the delay.”