Passengers on the Norwich to Sheringham Bittern Line face delays of up to 90 minutes after a signalling failure this evening.
A spokesman for Network Rail said faults had been discovered on two signals at the Walpole level crossing, at Antingham, shortly before 2pm.
It had taken staff some time to identify the problem but they had now done so and repair work was underway. She apologised to those affected.
The failure affected level crossings between North Walsham and Cromer. Network Rail staff had to drive out to the crossings to help ensure trains were able to cross safely.
At least one train, the 4.45pm from Norwich, had to wait 25 minutes just outside North Walsham station for the arrival of the next incoming train from Sheringham before it could proceed along the single-track rail.
Passengers on the train heading north were warned it would terminate at Cromer and they would have to wait about an hour for the next train to Sheringham.
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