The final stage of works to the route began on Wedesday, allowing vital work to be carried out across the area.
The 12 level crossings on the GNGE line, which runs between Peterborough and Doncaster via Spalding, are all being modernised as part of the rail modernisation project.
The new signalling system will replace 1930s mechanical technology with modern electronic systems controlled from Network Rail’s Lincoln signalling control centre.
Justin Page, area director for Network Rail, explained: “The GNGE line is an important route for both freight and passenger trains.
“Demand for rail services continues to grow and the upgrade of this line is an important project to help meet that demand.
“In just 12 days our engineers will install modern signalling which will help to allow for future increases in services as well as improving reliability.
“At the same time, ten level crossings will be upgraded with the latest technology and the barrow crossing at Spalding station will be removed – further improving the safety of our network.
“This is an essential element of our continuing investment in Britain’s railway.
“We apologise in advance for any inconvenience to passengers and the public during this time, and thank the local community for their patience while we transform the GNGE line.”
Due to the works, no trains are running between Sleaford and Peterborough, in either direction until November 3, but the works will improve safety, increase capacity and bring better performance and reliability.
They will reduce the need for heavy maintenance over a 15-year period and will increase capacity on the busy East Coast Main Line.
On completion, the £280 million, government funded GNGE project will deliver an upgraded diversionary route for freight traffic between Doncaster and Peterborough, which in turn will allow greater use of the East Coast Mainline (ECML) for passenger train paths.
For more details on closures, visit www.networkrail.co.uk/ improvements/Great- Northern-Great-Eastern/