First, the East Grinstead to Lewes line closed in 1958, then the Cuckoo Line in 1965, the Three Bridges to Groombridge in 1967, and finally the Wealden Line south of Uckfield in 1969.
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En route it crosses the Kent and East Sussex border, a distance of 5 miles (8 km), along the former Three Bridges to Tunbridge Wells Central Line / Cuckoo Line.
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Although its route actually never went near Castle Eden, it was also informally known as the "Cuckoo Line".
See also the nearby Rotherfield and Mark Cross railway station on the Oxted - Heathfield - Polegate line (Cuckoo Line)