Trains into a busy City of London station have been suspended on Friday morning due to a radio system fault.
The issue, affecting communication between train driver and signaller, means all lines are blocked between Moorgate and Drayton Park in north London.
There is currently no service at the following stations: Highbury & Islington, Essex Road, Old Street and Moorgate.
Disruption is expected until 9am according to National Rail .
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