A vehicle colliding with a bridge at Hanwell means trains between London Paddington and Slough may be delayed by up to 25 minutes or cancelled.
Disruption is expected until 10:00.
Alternative travel advice:
Great Western Railway
Tickets will be accepted on South Western Railway services between Reading and London Waterloo.
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.