NZR AB Class

The NZR AB class was a class of 4-6-2 Pacific tender steam locomotive that operated on New Zealand's national railway system. Originally an improvement on the 1906 A class, 141 were built between 1915 and 1927 by NZR's Addington Workshops, A & G Price Limited of Thames, New Zealand, and North British Locomotive Company, making the AB class the largest class of steam locomotives ever to run in New Zealand. An additional ten were rebuilt from the tank version of the AB – the WAB class – between 1947 and 1957, while another two North British-made locomotives were built, but were lost in the wreck of the SS Wiltshire in May 1922.