Haven't seen / can't find a thread about this: NRE is saying
Sounds bad.On Saturday 7 March, there was damage to the overhead electric wires at North Wembley junction, between London Euston and Watford Junction. There is a significant amount of work required to make repairs. Network Rail are putting resources in place.
Trains are unable to run between London Euston and Hemel Hempstead until 10:00.
Avanti West Coast
In summary, there will be a late start up to service and an early finish on Sunday 8 March.
The first planned service to leave from Euston will be London Euston to Liverpool Lime Street at 10:16.
Any customers due to travel before 10:00 are advised to travel later in the day where tickets will be accepted.
London Northwestern Railway
Road transport is running between Hemel Hempstead and Stanmore.
Your ticket can be used on Chiltern Railways, CrossCountry, East Midlands Railway, Thameslink, London Overground and London Underground services.
You may also use National Express West Midlands Buses on any reasonable route, and National Express Coventry, on routes 5 and 18, to complete your journey.
London Overground
You may use your ticket at no extra cost on London Buses and London Underground services such as the Metropolitan or Jubilee line.