Work at Fiskerton and Lowdham stations will begin on Saturday, 18 February.
The project involves driving steel piles deep into the ground to install foundations for the new section of platform.
Gary Walsh, area director for Network Rail in the East Midlands, said: "In the last year, we have carried out lots of improvements to the railway in East Nottinghamshire, as part of our Railway Upgrade Plan. The work at Fiskerton and Lowdham will create an easier journey for passengers entering and exiting trains at these stations."
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The platform extensions form part of a £48 million signalling improvement programme in East Nottinghamshire. The scheme has involved replacing old-style mechanical signals on the line between Lowdham and Newark with new modern digital models. Signalling control has also moved from lineside signal boxes to the East Midlands Control Centre in Derby.
The platform extension work is scheduled to be complete in May.
(LM/MH)
