More than 500 yards of train tracks have been laid by railway workers between Balcombe and Maidenbower.
As well as new track, Network Rail and its contractor Colas Rail laid new ballast – the crushed stones the track sits on – and new sleepers on Saturday March 19 and Sunday March 20.
A spokesperson for Network Rail said: “This will not only provide a quieter and more comfortable ride for passengers, but new track also requires less maintenance – and hence less disruption to services.
“A length of straight rail will typically last between 30 to 40 years, so it is long lasting too. Curved rail lasts less time because it wears out.
“We realise that passengers will have been disrupted as a result of this work, with buses replacing trains between Brighton, Lewes and Three Bridges, and we appreciate their patience.”
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