A fault with the barriers at a level crossing in the Welshpool area means that all lines are blocked.
As a result, trains running between Machynlleth and Shrewsbury may be cancelled or revised.
Disruption is expected until 12:15.
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.