The 360ft-long viaduct carries the Cambrian line over the Afon Dyfi (Dovey River) through the habitats of the area's protected species, including ospreys and grey geese.
Work started on site in September 2022 and took eight months, with a pause between March and mid-August 2023 to reduce the impact on wildlife.
Built in 1863, the historical timber structure in Powys has 15 pairs of wooden piles buried deep into the bed of the estuary, posing numerous challenges for the Network Rail team and contractor AmcoGiffen.
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The tidal nature of the Afon Dyfi meant that the environment was ever-changing, and the use of pontoons to access each of the wooden structures allowed the work to be carried out safely and efficiently.
The team successfully replaced parts of the wooden structure with Glass Reinforced Plastic (GRP) resin, a polymer made from recycled waste plastic. It means that the viaduct will be more durable and requires less maintenance, reducing disruption to local habitats.
Network Rail's route director for Network Rail Wales & Borders Nick Millington said: "It has been a huge challenge to complete the refurbishment of Dovey Junction Viaduct, working in storms and extreme weather while coping with flooding and a lot of mud.
"As well as completing the job safely, great care was taken to protect the environment along this beautiful stretch of railway and to recycle materials.
"We'd like to thank the local community and our passengers for their patience during this work and as we continue our restoration further along the line at Barmouth viaduct.
"These two projects will boost the resilience and reliability of this line for generations to come."
