A £20m project will upgrade the overhead power lines on Scotland’s original electrified railway.
The work will focus on sections of the North Clyde lines, which run from Helensburgh, Balloch and Milngavie through Glasgow’s west end and low‑level stations and makes up the busiest suburban network outside London.
The electrification of the North Clyde in 1960 marked the beginning of modern rail travel in Scotland.
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However, much of the original equipment in the area is now more than 65 years-old and requires renewal.
Preparatory work has already begun, including refurbishing the equipment that holds the overhead wires in place, such as the cantilevers and other supporting components.
More intensive engineering work to replace the wires themselves is scheduled over the Christmas and New Year period for the next three years, when passenger numbers are lower and the line can be closed with less travel impacts.
Ross Moran, route director at Network Rail Scotland, said: “This stretch of railway was where electrification began in Scotland and marked a real turning point. It changed how people travelled around Glasgow and helped shape the network we use today.
“We know how vital this area is to the railway as a whole. A single issue on the North Clyde can quickly affect services well beyond Glasgow, which is why this work is being planned now rather than waiting for more serious failures and wider disruption later.
“This project is about looking after the railway that people rely on every day. By renewing it now, we are helping to make sure it continues to serve passengers and communities long into the future.”
Mark Ilderton, ScotRail service delivery director, said: “The North Clyde routes are a vital part of Scotland’s Railway, connecting communities from Argyll and Bute right through to West Lothian, supporting thousands of journeys every day.
“This investment by Network Rail will help improve the long-term reliability of the infrastructure that keeps our electric trains moving.
“We know that some journeys will look a little different when the main body of work takes place later this year, which is why we’ll be working closely with Network Rail to keep customers updated, and make sure they have the information they need to plan ahead and travel with confidence.”
