Rail passengers are being warned their journeys could be delayed this morning due to signalling problems.
There are delays of up to 20 minutes and some cancellations on Great Western Railway between Reading and London Paddington due to signalling problem between Maidenhead and Slough.
Trains are running at reduced speeds on all lines towards London Paddington.
A statement on the Great Western Railway website said: "Due to a fault with the signalling system earlier today between Maidenhead and Slough trains have to run at reduced speed on all lines towards London Paddington.
"Train services running through these stations may be cancelled, delayed by up to 40 minutes or revised."
Disruption is expected until about 2pm.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article