Commuters at Euston station were facing huge disruption on Thursday due to a "trespasser" on the tracks.
The station was closed, and all trains cancelled, as authorities dealt with the incident from about 6pm.
Just before 7pm, all lines to and from Euston were reopened - but disruption was expected to last all night.
National Rail said: "All lines have reopened to and from London Euston following the trespasser having been removed.
"Trains will continue to be disrupted until the end of the day."
Virgin Trains, West Midlands Trains and London Overground services operate at Euston.
The Standard has approached British Transport Police for comment on the incident.
