All departures from London Euston train station are disrupted after damage to overhead wires.
National Rail have said that due to repairs to damaged electric cables between Hemel Hempstead and Watford Junction, services running through those stations may be interrupted. They warn of delays up to 40 minutes, amendments or cancellations as services return to normal.
Disruption is currently expected to last until 6pm. Passengers are advised to check the National Rail website before travelling.
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