A shortage of train drivers between Birmingham New Street and Stansted Airport means fewer trains will run. Trains running between these stations may be cancelled.
Disruption is expected until the end of service.
Customer advice
You may use your ticket on Thameslink services between Peterborough and London St Pancras International.
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 #XCService
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.