The K-class was a class of steam locomotives of the Western Australian Government Railways introduced in 1893/94 to haul heavier loads in particular on the Eastern Goldfields Railway. Their wheel arrangement was 2-8-4T, which was a tank engine.
The locomotives required heavier rails, 39kg/m in lieu of 23kg/m. [1]
The K class operated on narrow gauge 1,067 mm (3 ft 6 in) lines.
There is also a Co-Co K-class diesel locomotive of the 1970s.