There are cancellations to services between Milton Keynes Central and Watford Junction this morning (18/11).
The cancellations are due to a fault with the signalling system between Milton Keynes Central and Watford Junction.
Trains also have to run at reduced speed on the line towards London Euston.
A spokesperson says train services running through these stations may be cancelled or delayed by up to 15 minutes.
West Midlands Railway and London Northwestern Railway are reported to be affected.
UPDATE 10:21AM: Staff are currently onsite working to resolve this issue
