No mainline train services are able to enter or leave London’s Euston station on Wednesday morning due to a fatality on tracks in Hertfordshire.
National Rail Enquiries said the incident is affecting passengers travelling with Avanti West Coast, London Northwestern Railway and Southern.
Disruption is expected to continue until 10am.
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British Transport Police said it received a report of a casualty on tracks near Watford Junction station, Hertfordshire at 6.04am on Wednesday.
Paramedics attended but the person was pronounced dead at the scene.
Affected passengers are able to use tickets on some alternative routes.
Road transport is also being provided in some areas.