Euston station was plunged into chaos as all trains were cancelled coming into and out of London, London Northwestern Railway confirmed.
Engineers are currently on site assessing a issue on the line after a serious fault was detected on the overhead wires at Watford Junction.
We’ll be bringing you the very latest updates, pictures and video on this breaking news story.
For the latest news and breaking news visit: /news
Stay up to date with all the big headlines, pictures, analysis, opinion and video on the stories that matter to you.
Follow our social media accounts here on facebook.com/DailyExpress and @daily_express