Finchley Road tube station is temporarily closed due to severe delays on the Jubilee Line.
Commuters face busier trains and being held between stations as Transport for London fix a signal failure at Baker Street.
There is no service between Stanmore and Waterloo.
Tickets are being accepted by London Overground, Thameslink, Southeaster and DLR services.
There are also minor delays on the Victoria line due to an earlier train fault at Brixton.
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