The project, which involved steelworks, masonry repairs and repainting activities, was designed to extend the lifespan of the bridge.
The improvement works are part of a wider upgrade programme aimed at protecting and enhancing structures Scotland's Railway.
Work began on the bridge in May with a lane closure, as well as two weekends where the road was fully closed, and a series of nightshift activities to allow the railway to remain open.
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Early in July, the road was completely re-opened to traffic and remained open for the final months of the programme.
Suzanne McKay, scheme project manager at Network Rail, said: "Our investment in repairing and repainting the bridge at Quarry Street will protect the structure for years to come. It has also made a big difference to the appearance of the bridge.
"The line underneath the bridge as well as the road that runs over it, are both vital transport links for people in Hamilton and across Lanarkshire.
"We are grateful to the local community, as well as rail and road users, for their support and patience during these essential works."
