The Bakerloo Line has been part suspended for two hours because of a broken rail.
The service is suspended between Stonebridge Park and Harrow and Wealdstone because of the track fault just north of Wembley Central station.
The problem is also affecting London Overground services which are suspended from Willesden Juncion to Harrow and Wealdstone.
There is a good service on the rest of the Bakerloo Line and the rest of London Overground.
Tickets are being accepted on local buses and Network Rail is working to repair the problem.
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