Rail passengers travelling to or from London Euston have been warned they face major disruption.
National Rail had advised West Coast main line users not to travel on Sunday morning as engineers worked to fix damaged wiring.
It tweeted just after midday, saying some lines had reopened and services would start to resume.
Passengers using Virgin and London Midland services have been warned to expect delays throughout the day.
Trains may be delayed by up to 30 minutes or timetables revised.
Underground trains from Euston ran as normal, Network Rail said.
Services between London Euston and the following stations are affected:
- Birmingham New Street
- Glasgow Central
- Liverpool Lime Street
- Manchester Piccadilly
- Milton Keynes Central
- Watford Junction
‘It ain’t pretty’
Many passengers have taken to Twitter, using #WatfordJunction to ask train operators about travel arrangements.
Others have been sharing details of their journeys so far.
Some football fans said they were having trouble reaching Sunday fixtures.
Ross Kennedy, who had taken a weekend trip away, told the BBC he had been badly affected by the disruption.
“Friday night was a disaster at Euston, and we were about two hours delayed getting up to Manchester,” he said.
He said he was told by Virgin at around 11:00 on Sunday that he couldn’t have a refund.
After 30 minutes on the phone, he said, he was told to proceed as normal as his train wasn’t being delayed.
“I was asked where I heard about the disruption, because there was no disruption. I was slightly shocked and surprised, given the guidance on their website was not to travel and to contact them for a refund.”
Advice for passengers
“If you must travel, please check the journey planner to make sure the line has reopened before starting your journey,” Network Rail said.
“Trains that do run are expected to be busier than normal, so travel should be considered for later in the day or on Monday where possible.”
However, it also warned disruption was likely to “continue until the end of service, due to train crew and trains being in the wrong locations”.
Tickets valid for travel on Sunday would be accepted on Monday, it added.
Trains will run between London Euston and Willesden Junction only.
Replacement road transport will run every 20 minutes between Watford Junction and Harrow-on-Hill.
Customers can also use London Underground and London Buses on all reasonable routes to help with journeys.
Tickets can be used on Chiltern Railways between Birmingham Moor Street and London Marylebone and Great Western Railway on reasonable routes into London Paddington.
Passengers can use CrossCountry, Chiltern Railways, TransPennine Express and Virgin Trains East Coast via any reasonable route until further notice.
Virgin Trains customers who choose not to travel may apply for a full refund at the point of purchase.
Why is this happening?
Overhead wires near Wembley in north-west London were damaged on Friday.
Engineers were working “as quickly as possible” to fix the problem, a Network Rail spokesman said.
He said the company was “unsure at this stage of the cause of the damage”.
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Article source: http://www.bbc.co.uk/news/uk-england-42208844