The South African Railways Class NG3 4-6-2T of 1907 was a narrow-gauge steam locomotive from the pre-Union era in the Colony of Natal. In 1907, the Natal Government Railways placed six 4-6-2T Pacific type narrow-gauge steam locomotives in service. In 1912, when these locomotives were assimilated into the South African Railways, they retained their engine numbers, but with an "NG" prefix added. When a system of grouping narrow-gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were designated Class NG3.