The South African Railways Class A 4-8-2T of 1888 was a steam locomotive from the pre-Union era in the Colony of Natal. In 1888, the Natal Government Railways placed the first five of its eventual one hundred Class D 4-8-2T steam locomotives in service. The last was delivered in 1899. They were the first locomotives in the world to be built with a 4-8-2 wheel arrangement, later to become known as the Mountain type. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class A. In 1915, another two Class A locomotives were built from spare parts.