The Rewanui Incline was on the West Coast of the South Island, just north of Greymouth. A Fell centre-rail was used for braking purposes only - but quite a lot of gear was sent south from the Rimutaka Incline. W and We class locos, deemed as less successful on the Rimutaka Incline, were the mainstay on the Rewanui, along with Ww locos fitted with centre-rail brakes. Brake vans went south at various stages, particularly after the Rimutaka line closed in 1955. The Rimutaka Incline was between Summit and Cross Creek, some 60km northeast of Wellington on the government's Wairarapa Line - quite distance from and in a different island to the Rewanui Incline. See more about this system at this link:

http://www.rimutaka-incline-railway.org.nz/history/fell-centre-rail.html