Engineers carried out the project over the last 16 days in the Hinksey area, which has seen 11 line closures in the last 14 years due to flooding disruption.
Works included raising the track and renewing 200 metres of track, as well as installing 44 culvert sections to allow water to flow from one side to the other.
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In addition, nine railway points have also been renewed, two bridge decks refurbished and a new foot bridge installed.
Joanna Grew, Network Rail's commercial scheme sponsor for the project, said: "Our engineers have worked safely and diligently to complete this work to schedule with minimal disruption for passengers.
"Our Railway Upgrade Plan is delivering significant investment into the railway network which will provide a bigger, better, more reliable railway for passengers."
(LM/CD)
