Rail commuters have been thanked for their patience after vital upgrades were completed over the Easter weekend on the Norwich to London line.
The route to the capital, which passes through Diss, is subject to £170m of improvements in 2015.
Overhead lines were upgraded at Chadwell Heath, Romford and Ilford to improve reliability and prepare the line for Crossrail. Engineers also upgraded the track layout at Brentwood to prepare the line for Crossrail.
Steve Cassidy, Network Rail area director, said: “We would like to thank passengers for their patience during this disruptive work.
“We try our best to minimise the impact on passengers and do most of the work behind the scenes, but there are big pieces of work that can only be completed when the railway is clear of trains.
“We used the time to successfully upgrade the overhead lines on this busy main line, which will help to provide passengers who travel on this route every year more reliable journeys.”
Andrew Goodrum, customer service director of Abellio Greater Anglia, added: “We’re very grateful for the cooperation and patience of our customers over the Easter period while Network Rail carried out works to upgrade the railway.
“These improvements will help in providing a more reliable service on the Great Eastern Main Line.”