A fault with the signalling system between Trimley and Derby Road means that trains have to run at reduced speed on the line between Ipswich and Felixstowe.
As a result, trains running between these stations may be cancelled or delayed by up to 30 minutes.
Disruption is expected until 17:15.
Customer Advice:
A rail replacement bus service will be in operation between Ipswich and Felixstowe.
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.