King's Cross trains resume after power supply problems
King's Cross station has reopened after a power supply problem stopped all trains coming in and out of the central London terminal.
East Coast, First Capital Connect, First Hull Trains and Grand Central and now running but are subject to delays.
Network Rail said it would take some time for services to get back to normal and advised passengers to use alternative routes if possible.
London underground services were unaffected.
Routes affected by the delays included the East Coast main line expresses from Edinburgh, Newcastle, York, Sunderland, Leeds, Doncaster and Grantham to London, as well as suburban services from Peterborough via Huntingdon, Hitchin and Stevenage and via the Hertford loop.
The Javelin services to Stratford International for the Olympic Park run from the neighbouring St Pancras station were not affected.