Around 1,200 metres of new track has been installed as part of the project.
In addition, existing track has been remodelled between Manchester Victoria and Rochdale to link the new platform to the rail network as part of a £1 billion Northern Programme investment.
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The new 135-metre platform will allow trains to turn back at Rochdale from Manchester Victoria, enabling more services between the two stations.
Work will continue over the coming months as engineers complete surfacing work on the platform and install lighting, passenger information screens and fencing.
The next phase of work to strengthen the main bridge into Rochdale station will begin this summer.
Alex Hynes, MD of Northern Rail, said: "Investing in local improvements which provide network wide benefits for our customers is positive news. What has been achieved by the upgrade at Rochdale will spread service enhancements across the North West as well as into Yorkshire."
(LM)
