There is disruption to train services in Milton Keynes.
Lines were shut earlier today due to a gas leak between London Euston and Watford Junction.
The disruption meant services were unable to depart from and travel into London Euston for several hours.
Lines have now roepened but train services services between these stations may still be cancelled or severely delayed by up to 60 minutes. Major disruption is expected until 15:00, National Rail states.
Customer advice can be found here.