Stranded passengers walk along railway tracks to station
Passengers had to walk along a railway line to safety after they were left stranded by train electrical problems.
Some said they waited for hours in the "cold and dark" on Thursday evening before they were evacuated from the carriages along the tracks.
Passengers said a ladder had been put against the side of the train at one point to help them get off.
Repairs to damaged overhead wires were carried out by Network Rail overnight but disruption is expected to continue.
Train operators Govia Thameslink Railway (GTR) and Greater Anglia have apologised for the disruption.
Passengers on the 17:13 GMT service from London Liverpool Street had to walk about 100m into Cambridge station, said Greater Anglia.
They were escorted by staff from British Transport Police and Network Rail.
GTR, which runs trains between London and King's Lynn via Cambridge, said the problems were first detected at 18:20 GMT and then traced to a damaged unit on a train.
As that train was moved into Cambridge station it developed further problems and by 19:10 both the King's Lynn and London-bound lines from Cambridge were blocked, causing delays to its services.
The lines were reopened at 01:40 on Friday. However, disruption is expected to continue into the morning.
Network Rail said it would investigate the cause of the power line failure.