The New Zealand DI class locomotive was a class of diesel-electric locomotive in New Zealand. They were built by English Electric at their plant in Rocklea, Queensland in Australia. The class is very similar to the Queensland Railways 1620 class locomotives. At the time of their introduction, the class was seen as an alternative to the DB class for use on lightly laid secondary and branch lines, more so in the South Island. The World Bank financed introduction of the Japanese built DJ class in 1968, which ensured that no further DI class locomotives were purchased by New Zealand Railways.