Train services running to and from Marylebone this afternoon could be delayed or cancelled.
Chiltern Railways is warning that trains may be cancelled or delayed by up to 60 minutes due to a problem with line side equipment.
The train operator said that tickets are being accepted with Virgin Trains, London Midland, Cross Country, First Great Western and London Underground due to the disruption.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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 here