The NZR O class consisted of six steam locomotives, 14.10m in length, 0.921m of driver diameter, and with a 1.067m gauge ,that operated on New Zealand's national rail network, and after almost four decades of service, were all withdrawn in May 1922, in which none have survived to be preserved.
The NZR O class consisted of six steam locomotives that operated on New Zealand's national rail network. 46 ft 3 in (14.10 m) 36.25 in (0.921 m) 3 ft 6 in (1,067 mm) After almost four decades of service, all six were withdrawn in May 1922. None survived to be preserved, although two engine frames and 5 tenders from O class locomotives are known to exist near Summit on the former Rimutaka Incline. 
