Bebington currently has Class 508 EMUs operating on Merseyrail. Class 508s have previously been on London suburban services and with (Connex) South Eastern stopping services, such as London Bridge to Tunbridge Wells.
Melksham had 74,220 entries & exits in 2017/18 according to ORR statistics and was ranked the 1,849th busiest station on National Rail.
The next candidate, at number 1,850 in the busiest stations league, with 73,378 passengers in the same period, was Dalton (Cumbria).
The Addiscombe branch line used to have shuttles between Elmers End and Addiscombe until closure on 30 May 1997. This branch was replaced by the Croydon Tramlink. That exact day, and also replaced by the Croydon Tramlink, the West Croydon to Wimbledon branch also closed.