The scheme follows work by Network Rail engineers to install a total of 274 metres of new track between Stowmarket and Manningtree, as well as work to replace four switches and crossings units over the last three weekends.
Ballast, the stones that form the track bed, was also replaced to improve drainage and keep the track in place.
Meliha Duymaz, Network Rail's route managing director for Anglia, said: "This work is essential to keep services running smoothly and safely every day on the busy mainline. We've replaced the worn track as part of our Railway Upgrade Plan to improve reliability for all passengers using services between Norwich and London. I'd like to thank passengers for their patience while we carried out this work."
Jamie Burles, managing director of Greater Anglia, added: "We appreciate that engineering works is an inconvenience to our customers, but this work is essential to make the railway more reliable now and in the future."
(LM/MH)
