Major disruption to multiple rail services across the country is expected throughout the day due to damage to overhead wires.
National Rail said trains have come to a halt due to issues with electric cables at Arlesey, Bedfordshire on the section of track between between Peterborough and Stevenage.
As result, lines are blocked and trains may be severely delayed or cancelled.
The incident will affect passengers travelling on services provided by Grand Central, Great Northern, Hull Trains, LNER, Lumo, and Thameslink, including those travelling as far afield as Edinburgh.