The works will see 820 yards of drainage improvements at various locations between Reston and Drem will be completed to stabilise an embankment.
Engineers will replace 3.8 miles of worn railway track with new stone ballast, sleepers and rails, and more than 30 engineering trains will be deployed. At the same time, de-vegetation works will be taking place with teams cutting back overhanging trees and bushes at various points on the line.
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When complete, the line be more resilient and reliable throughout the year.
Liam Sumpter, Network Rail route director for Scotland, said: "The work we are undertaking is vital for the long-term future reliability of the line.
"Our engineers will be working around-the-clock to complete these complex projects as quickly as possible.
"We understand the inconvenience these works will cause to some passengers and residents and we thank them for their patience. We are committed to completing this work quickly and limiting disruption where possible."
