Part of the Central line has been suspended in east London after a signal failure.
There is currently no service between Hainault and Woodford on the line due to the signal failure.
Passengers are also experiencing minor delays on the Epping branch of the line between Leytonstone and Epping.
There is a good service on the rest of the line.
Transport for London (TfL) said tickets will be accepted on London Buses via any reasonable route.
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