On a historical note, Castle Hill Station is aptly directly beneath the
site of the old Castle Hill Station on the former Rogans Hill railway line.
From my wife's photos here is the new station entrance looking south and,
looking north, the railway-themed playground on the site of the old
station, including an old railway signal that has been placed there as a
monument. Nice touch, but could do with some interpretative plaque.
Apparently there is still some of the old track in place under the road at
the bus interchange (formerly Old Northern Rd before the deviation).
Looking south (from Wikipedia):