Some lines have now reopened following the discovery of a wartime bomb near the railway at Wolverton. While service recovers, trains running between Rugby and Milton Keynes Central may still be cancelled or delayed by up to 35 minutes.
Disruption is expected until 19:15.
Avanti West Coast customer advice:
You can use your ticket at no additonal cost on Chiltern Railway services between Birmingham Moor Street and London Euston in both directions.
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.