Commuters are facing travel chaos at Euston station this afternoon, due to a broken down train between Harrow & Wealdstone and Watford Junction.
Rail operator London Midland warned that some trains in and out of Euton may be delayed by up to one hour.
"Owing to a broken down train blocking one of the northbound lines at Bushey we are currently unable to operate the normal number of services departing London Euston," London Midland said in a statement.
"Engineers have managed to rectify the fault and the train will be moving shortly allowing the line to be reopened within the next 30 minutes. Whilst we are running a reduced number of services, ticket acceptance has been agreed with the following to assist passengers in getting to their destination."
The rail company said disruption is expected to continue until 3pm.
This afternoon's travel problems follow a slew of issues across the capital this morning, which saw trains into London Liverpool Street cancelled, and no service from Highbury & Islington station - on top of the ongoing Southern rail strikes.