Trains faced even more significant disruption after an incident on the tracks.
Services to Ipswich from the capital were delayed after it was reported that a person was on the tracks near Colchester at around 2pm on Monday.
A witness said that emergency services are arriving on scene and the trains are "packed" with families on day trips for the summer holidays.
The disruption was cleared later on Monday afternoon after it was confirmed that the tracks were clear.
A passenger then said: “The train to Norwich has stopped, and an announcement came over the PA that there is an ongoing incident.
"Then lots of police and train staff went running along the platform and are on the tracks; there is no estimate on our delay."
Greater Anglia's website stated that services were delayed due to "trespassers on the railway."
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