A fault with the signalling system between Watford Junction and London Euston is causing disruption to journeys running between these stations.
As a result, trains may be cancelled or delayed by up to 35 minutes.
Disruption is expected until the end of the day.
Customer Advice
Avanti West Coast
You may use your ticket on London Northwestern Railway services between Crewe and London Euston at no extra cost.
London Northwestern Railway
You may use your ticket on Avanti West Coast services Crewe and Birmingham New Street at no extra cost.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner
Twitter:
If you would like to follow this incident on Twitter, please use #WatfordJunction
Compensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.