Harlesden
Member
Many original 19th Century stations have been closed and slightly relocated over the years (is there a list of these anywhere on the web?). Which current station is the furthest from the original station bearing the same name?
Wigan Wallgates moved twice, when it originally opened in 1848 with services to Bolton it was parallel to North Western where the car park and that stone pub/club with a gated backyard was later built, in 1855 services to Southport were added and it moved much further on to where the Wigan Sidings are today, finally in 1896 it moved to its present location gaining the Wallgate moniker in 1924.
Haddenham moved towards Bicester.
You can still clearly see the old down platform at the old station from the window of passing trains. It's about 500 yards south of the current station, not far from an overbridge, it's very easy to see if you are stopping at Haddenham & Thame Parkway as you just look out of the window (left hand side in direction of travel) when the train is slowing down to stop. I believe that overbridge is called Station Road which now might confuse people in Haddenham looking for the station!
Swanley Junction was also moved nearer London on electrification, and IIRC Nunhead also, while Eltham Well Hall was moved (and Eltham Park closed) for road building.
I think that I am right in saying that the original Cathays station in Cardiff was on a different line (Rhymney Valley) to the one that the current station is (Rhondda Valley).
This meant that there was / is a distance of maybe half a mile between the two stations. The remains of the platforms of the original station used to be visible, but I don't know whether they still are.
Lea Green, closed 1955 was replaced by a new Lea Green station a few years ago, located about ¾ mile to the east (and no longer in the Lea Green district).
In which case it seems to win the prize for greatest distance, which the OP asked.