Lines have now reopened following an earlier trespass incident between Birmingham New Street and Wolverhampton.
As service recovers, trains running between these stations may be cancelled, delayed by up to 25 minutes or revised.
Disruption is expected until 18:30.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.
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.