The South African Railways Class A 4-8-2T of 1888 is a steam locomotive from the pre-Union era in the Natal Colony.In 1888 the Natal Government Railways placed the first five of its eventual one hundred Class D 4-8-2T tank steam locomotives in service. The last was delivered in 1899. They were the first locomotives in the world with a 4-8-2 wheel arrangement, later to become known as the Mountain type.