MP for Witham Priti Patel, is advising all rail passengers travelling at weekends to check before they travel.
Network Rail is preparing for ten weekends of upgrade works starting next weekend, February 6.
Network Rail have advised that major upgrade work will take place on the Great Eastern main line between London Liverpool Street and Ingatestone, as part of the ongoing investment to modernise the vroute into London.
The works which include the replacement of overhead power lines and replacing old track can only be carried out when the railway is closed to trains so journeys may be affected.
Ms Patel said: “I am thrilled that yet more works to improve our railways are taking place, we have fought hard for this major investment that will provide long-term benefits for commuters and passengers.
"There is never a good time to close the railway as someone will always be disadvantaged. I would advise anyone travelling to check before they travel and allow extra time for their journey.”
During the first eight weekends, no train services will operate between London Liverpool Street and Ingatestone or Wickford.
An Abellio Greater Anglia bus replacement service will be operating between Ingatestone and Wickford, calling at Newbury Park for the central line.
TFL Rail will also be operating a bus replacement service between Stratford and Shenfield, calling at Newbury Park as well.
During the final two weekends, Abellio Greater Anglia rail replacement services will operate from Chelmsford and Witham to Billericay where passengers can change for train services to and from London.
TFL Rail replacement services will operate between Gidea Park and Shenfield on the first of the two weekends and all TFL Rail services will re-open for the final weekend.