A trespasser on the railway track north of Ipswich caused services to be delayed while police carried out searches in the area.
British Transport Police received reports of a man trespassing on the track between Ipswich and Needham Market at around 2.40pm.
A police spokesman said officers carried out a search of the area but were unable to find the trespasser.
Greater Anglia said the line was closed with services delayed until around 4pm.
A spokesman for the operator said: “Trains were having to run at a lower speed than normal between Ipswich and Needham Market following reports of a trespasser on the railway track.”
The first trains to be affected were the 1.30pm Norwich to London Liverpool Street and the 1pm London Liverpool Street to Norwich services.
Rail passengers whose journey was delayed by 30 minutes or more may be entitled to compensation for a portion of their fare.
People can visit here for details on how to claim.
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