Engineers are underway with work to replace the Windsor Road bridge in Cardiff.
The structure, which spans five railway lines, is being replaced as part of Network Rail's Railway Upgrade Plan.
Workers had to re-design the foundations after starting work on site in January last year by installing a lightweight polystyrene-block solution on the new embankments.
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Mark Bull, project manager for Network Rail Wales, said: "This solution was chosen over more traditional construction methods due to its high strength and versatility– proving suitable for the challenging ground conditions encountered at site.
"In addition these large white blocks are light enough to be moved by hand, minimising noise for our neighbours and reducing pollution levels requiring less machinery on site and fewer deliveries."
The project was originally expected to finish in spring 2016, but has now been delayed until summer 2016, with the road expected to open in early July.
(LM/JP)
