Trains between Thetford, Norwich and Cambridge are being cancelled and delayed due to a signalling fault.
Services through Thetford and Brandon will be disrupted through lunchtime, with disruption expected until 2pm.
Greater Anglia said the issues are due to a fault with the signalling system between Ely and Littleport.
The train company said on their website: “Due to a fault with the signalling system between Ely and Littleport trains are having to run at a reduced speed, this is affecting services departing Ipswich going towards Peterborough and services departing Norwich going towards Cambridge and vice versa.”
Greater Anglia tickets are being accepted on Great Northern services between Cambridge and Ely, East Midlands services between Norwich and Peterborough, and Cross Country services between Cambridge and Peterborough.
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