This is due to waiting earlier for a train crew member.
This will affect journeys
from 01/02/2015 10:01 to 02/02/2015 01:29.
King's Cross St.Pancras.
From 02:00, Saturday 31 January 2015 to 03:00, Monday 02 February 2015.
Some lines will be blocked.
All services will be replaced by buses between Witham and Braintree. There will be no train services between Ipswich, Manningtree, Colchester and Witham.
On Saturday 31 January and Sunday 1 February 2015, buses will replace mainline services between Ipswich/Manningtree/Colchester Town/Colchester and Billericay, where passengers are to travel on connecting Southend Victoria services to/from London Liverpool Street.
Buses will also replace trains between Witham and Braintree, and between Marks Tey and Sudbury.
A revised train service will operate between Colchester Town and Clacton-on-Sea; Thorpe-le-Soken and Walton-on-Naze; Manningtree and Harwich Town; Manningtree and Ipswich/Norwich.
Liverpool Street to Southend Victoria services will run to an increased frequency of four trains per hour.
Wickford to Southminster services will run hourly.