A broken down train between Princes Risborough and High Wycombe means that the line is currently blocked.
As a result, trains running through these stations may be cancelled or delayed by up to 40 minutes.
This is expected until 17:30.
Customer Advice
You may use your ticket on Great Western Railway services between Oxford and London Paddington at no extra cost.
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.