Wait a minute - wasn't KA 949 the locomotive that was wrecked in the 1953 Tangiwai disaster? Yes it was. This is actually KA 942 playing the part of KA 949 in a movie about the disaster, seen here at Otaki on 6 December 2010 which was standing in for Taihape (where the old station has now gone, and even if it was still there the electric catenary would now be anachronistic). KA 942 has played KA 949 before in a David Sims program for TV.
A Rob Martin photo from the Mainline Steam website.