(Updates with latest figures)
LONDON, Feb 23 (Reuters) - Eight passengers were seriously injured and more than 100 trapped when a London to Glasgow train derailed in northwest England on Friday, rescue services said.
"Eight people were seriously injured and we have 40 walking wounded accounted for from one of the carriages," said Claudine Shacklock, a spokeswoman for the North West Ambulance Service, giving the latest update on the train carrying 180 passengers.
"But it is not safe to gain access to the other carriages," she said. Rescue services were unable to reach them until the power lines had been switched off.
RAF helicopters were ferrying the injured to hospital.
The cause of the derailment was not immediately known.
Shacklock said the train, run by Virgin Trains, was travelling from London’s Euston station to Glasgow and that the ambulance service first got reports of the incident at 8:16 p.m. (2016 GMT).
It derailed near a village in the Lake District.
Virgin Trains is 49 percent-owned by British bus and train operator Stagecoach Group Plc (SGC.L) and 51 percent by Richard Branson’s Virgin Group [VA.UL].