The South African Railways Class 1A 4-8-0 of 1910 was a steam locomotive from the pre-Union era in the Colony of Natal. In 1910, the Natal Government Railways placed 21 improved Class B 4-8-0 Mastodon type tender locomotives in service. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class 1A.