The road will close from October 18, 2021, until April 1, 2022, with a diversionary route in place via Little Dovehill, Gallowgate, High Street and vice versa.
Residents and businesses in the area have been advised of the work, which will involve grit-blasting old paint off the structure as well as steelwork repairs and repainting.
The investment is part of a wide-ranging structural modernisation programme aimed at protecting and improving Scotland’s Railway.
Stephen Orr, Scheme Project Manager at Network Rail, said: “Our work at Bell Street will not only extend the lifespan of the bridge, but will help us to continue to run a safe and reliable railway through Glasgow.
“In order to complete this project as quickly and as safely as possible, we need to close the road under the bridge to traffic. Having the road closure in place means we can carry out these works with minimal overall disruption and inconvenience to the community.
“We are grateful to the community for their patience while we carry out these vital improvement works.”
Ahead of work beginning, Network Rail has organised an online public information event to offer members of the public the chance to ask questions directly to members of the project team.
Members of the public can book a slot by visiting the dedicated project website at https://scotlandsrailway.com/projects/bell-street/events.
If you have any questions about this work, you can contact Network Rail’s 24-hour national helpline on 03457 11 41 41. For the latest information and progress updates follow on Twitter @NetworkRailScot.