The redevelopment of Splott Road Bridge forms part of the company's electrification of the South Wales Mainline.
The existing 117-year-old structure will be demolished and replaced with a new and improved structure, heightened to give clearance for new electric trains and strengthened to withstand modern city centre traffic.
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Essential upgrade work will start on the carriageway carrying traffic from Splott into Adamsdown in August 2017, with reopening scheduled in early 2018. The remaining side of the bridge will then close, with the second phase of the bridge's reconstruction completed by autumn 2018.
Electrification of the mainline to Cardiff is expected by 2019.
Karl Gilmore, Programme Manager for Network Rail Wales, said: "Reconstruction of this bridge, as part of our Railway Upgrade Plan, is essential as we prepare the South Wales Mainline for the new fleet of electric trains.
"Electric trains will result in more seats, faster, more reliable journeys for passengers and an economic boost for South Wales thanks to better connectivity."
(LM/JP)
