Thousands of rail passengers are being urged to re-schedule their journeys after a power failure caused havoc on the East Coast mainline.
Trains between London’s King’s Cross station and Peterborough ground to halt as an overhead line was brought down.
Engineers heading to repair the problem at Huntingdon, Cambridgeshire, were hampered by icy roads.
Hundreds of passengers were stuck on six trains with some having to be taken from the carriages using ladders.
A spokesman for East Coast advised travellers to re-schedule their journeys until Wednesday.
Although trains were still leaving stations in Edinburgh, Newcastle and York, a spokesman for East Coast said services would stop at Peterborough.
He added that all services would be subject to delays and cancellations.
Passengers heading north from King’s Cross were advised to use alternative services from St Pancras, heading to Yorkshire, or on the West Coast mainline from Euston to Glasgow.
East Coast managing director Karen Boswell said: “East Coast apologises for the inconvenience this will cause to passengers who are planning to travel today, due to severe damage to the overhead power lines at Huntingdon.
“Network Rail staff are on site and are working fast to fix the problem but unfortunately we currently have no estimate as to when the line will reopen.
“Our staff are working hard to get our passengers currently en route to their destinations as soon as possible with the minimum disruption.”
Travellers stuck on a train near Huntingdon were told they would have to clamber down ladders to get back to the station.
Passenger Ian Dormer, who was heading to Huntingdon, said: “We’ve been told we’ll have to use a ladder from the train on to the trackside in groups of 20.
“We’ll then be led down the track to the station.”
However, he praised rail staff – who have kept passengers’ spirits up by handing out hot drinks and biscuits.
A Network Rail spokesman said: “Services on the East Coast main line are significantly disrupted after overhead wires were brought down near Huntingdon station at around 0800 GMT.
“Our engineers are on site and working to fix the problem. It is anticipated that there will be disruption on this line for the rest of the day. Passengers are advised to check with their train operator or with national rail enquiries.”
Wintry conditions are still wreaking havoc across England, affecting roads and halting many flights at Heathrow.
Major incidents include:
Heathrow Airport is operating no more than a third of all flights until 0600 GMT on WednesdayMore than 100 passengers were stuck for six hours on a Southeastern train between Kemsing and Otford in Kent when rail lines frozeFarmers using snow ploughs were drafted in to help gritting lorries in DorsetA half-mile long queue formed outside St Pancras station as travellers tried to get on board Eurostar servicesWidespread cancellations across England’s railway network including First Capital Connect, First Hull Trains, Grand Central, the TransPennine Express, the Stansted Express, Heathrow Express, Virgin Trains, South West Trains, First Capital Connect and Chiltern Railways
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