Tree branches making contact with overhead wires between Ipswich and Colchester, causing disruption to rail services, have now been cleared.
Greater Anglia reported that delays were expected for the rest of the day and had cancelled some train journeys up to 3.30pm.
The main line between Colchester and Ipswich is now clear.
Advance ticket holders were told they were eligible to travel on earlier or later trains as a result of the disruption.
The train company directed people to their Delay Repay scheme to reclaim the cost of their tickets if they had been delayed by 15 minutes or more.
Also causing travel problems in the East of England today is a points failure at London Liverpool Street, which has also been resolved.
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