The South Wales Mainline is undergoing an extensive electrification programme as part of Network Rail's £40 billion Railway Upgrade Plan.
Engineers are raising the height of the Cardiff Road bridge to make room for overhead wires to power a new fleet of electric trains.
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Network Rail has now released a time-lapse film of the project which shows the structures demolition and reconstruction in Newport.
Andrew Griffiths, programme manager for Network Rail Wales, said: "The film demonstrates the scale of the project and the level of work involved.
"Electrification will provide a bigger, better, more reliable railway for passengers and improve links from South Wales to major towns and cities, including London."
Once the project is completed by late spring, work will begin to redevelop and upgrade the Maesglas Road bridge and Bridge Street Road bridge in the city centre.
(LM/MH)
