The company will deliver enhancements to nine stations on the route between Holytown Junction and Midcalder Junction.
Features include platform reconstructions and renewals and enhancements to lighting, CCTV and customer information systems. Two stations at Livingston South and Breich are to be complete rebuilt with platforms extended at Carfin, Shotts and West Calder to enable the introduction of longer trains on the route.
Work on the stations element of the project is due to be completed in autumn 2018.
The electrification of 74km of railway along the Shotts line, as part of a wider £160m Scottish Government investment in the line, is due finish by March 2019.
Iain McFarlane, route delivery director for Network Rail, said: “This contract is another step forward for the delivery of the Shotts electrification project and further underlines our commitment to investing in and enhancing our infrastructure as part of our UK-wide railway upgrade plan.
“Electrification of the line across North Lanarkshire and West Lothian coupled with improvements at stations will transform the journey experience for rail passengers who will enjoy the benefits of improved services for many years to come.
“Throughout this project we will work closely with contractors, train operators and other stakeholders to deliver in the most efficient and cost-effective way possible while minimising disruption for both lineside communities and passengers.”
Martin C Smith, managing director at Carillon Powerlines, said: “We are delighted to have been awarded this contract to electrify the Shotts line across central Scotland and we look forward to working with the project team to enhance the railway network.
“This award reflects the depth of experience we can demonstrate in delivering infrastructure enhancements in a railway environment and will further enhance the relationship we have developed with Network Rail.”