Passengers face New Year's Eve chaos after day of disruption on Eurostar
Some passengers have been left stranded on trains overnight after power was stopped
Eurostar has resumed some services to Europe today, but warned the earlier power supply issue remains and "strongly" advised passengers to postpone their journey.
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A power supply problem caused major disruption earlies as services to and from London were "suspended until further notice".
Delays of at least four hours impacted travel from the UK, with huge queues of frustrated passengers pictured at St Pancras Station as well as Folkestone.
Meanwhile other passengers were left stranded on trains overnight after some services grounded to a halt with no power.
On Tuesday evening, engineers were still struggling to restore full service with operator Getlink saying trains are running on only one of the tunnel’s two tracks.
The backlog along with the reduction in services is likely to impact passengers into New Year's Eve.
The 06:01 service has already been cancelled by Eurostar.
A message to customers on the train operator's website said earlier: "As the Channel Tunnel has partially reopened we will start to resume services.
"The overhead power supply issue remains, and we strongly advise all our passengers to postpone their journey to a different date.
"Please don't come to the station if your train is confirmed as cancelled.
"We regret that trains that can run will be subject to severe delays and possible last-minute cancellations.
"Please check for live updates on the status of your train on the Train status and timetables page."
Eurostar's website shows two departures from St Pancras to Paris this evening, leaving at 6.01pm and 7.01pm.
Getlink, which manages and operates the tunnel, said in a statement: "An incident related to the power supply to trains occurred last night in part of the Channel Tunnel, affecting train and shuttle traffic. A technical intervention is required, which is currently underway.
"The service is temporarily suspended in both directions. Traffic is expected to resume gradually around 1500 CET for LeShuttle customers.
"Our teams are working to restore the situation as quickly as possible.
"Waiting times will be adjusted throughout the day.
"Eurotunnel apologises for the inconvenience and thanks its customers for their patience and understanding."
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Significant disruption to journeys through the Channel Tunnel are "likely for the remainder of the day", a Department for Transport spokesperson said.
The spokesperson said: "Eurotunnel is working with operators to resume some services while repairs to overhead electrical cables in the Channel Tunnel are ongoing, however significant disruption is likely for the remainder of the day.
"We are working with Eurotunnel, Eurostar and the Kent and Medway Resilience Forum (KMRF) to minimise disruption for passengers.
"Passengers are encouraged to check with their operator for updates and guidance."
A family from Nigeria said their trip to Paris to take their children to Disneyland had been a "complete disaster" after their Eurostar train was cancelled.
Charles Nduka-Eze was on a train with his family from London to Paris at around 7am on Tuesday morning before it returned to London.
Speaking at King's Cross St Pancras, he said: "In a nutshell, it's a complete disaster."
Mr Nduka-Eze said the group had checked out of their London hotel and had already paid for their holiday in Paris including river cruises and to take the children to Disneyland as well as hotel rooms for nine members of his family.
"I'm not concerned about the refund for now, I'm thinking about what to do," he said.
"We don't know what's going on so I've got a sister over there trying to find out what's the next thing to do because we're just confused, to be honest."
His sister said the group had originally arrived at St Pancras at 5am, adding: "We're stranded."
Francis Collings said his Eurostar service from St Pancras to Paris was grounded to a halt somewhere outside Folkestone around 9.15pm, with power being turned off around 11pm.
"About four hours ago, maybe about at 11pm at night, the power was turned off," he told Sky News.
"So we have lighting, but it's low lighting, but this seems to have affected the toilets, which don't seem to want to flush.
"Six hours after the train stopped, we're still here, not entirely sure what's going to happen because there's a fault somewhere, we believe, in the tunnel, but we've also been told it's with the train and there was a fault with a carriage and there's talk of locomotives pulling other trains that are further up the line out of the way."