The NZR JA class were a type of 4-8-2 steam locomotive used on the New Zealand railway network. The class was built in two batches, the first batch was built at Dunedin's Hillside Workshops between 1946 and 1956 and the second batch by the North British Locomotive Works in 1951. To distinguish between the batches, locomotives are identified by their maker. The class had relatively short lives of between 12 and 24 years, as they were replaced by diesel locomotives as part of NZR's dieselisation process. Nine JAs lasted until the end of steam on 26 October 1971.