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Passengers are warned to expect delays on the Norwich to Cambridge railway line due to signalling problems.
According to Greater Anglia there is a signalling problem between Wymondham and Attleborough which means trains have to operate at a reduced speed.
Trains may be up to 20 minutes delayed as a result of the problem.
Network Rail engineers are working on the issue and a spokesman for Greater Anglia apologised for inconvenience caused.
The disruption is expected to last until around 8pm.
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