The South African Railways Class 10B 4-6-2 of 1910 is a steam locomotive from the pre-Union era in the Transvaal.In March 1910 the Central South African Railways placed ten Class 10-2 steam locomotives with a 4-6-2 Pacific wheel arrangement in service, of which five were built with and five without superheaters. In 1912, when the five superheated locomotives were assimilated into the South African Railways, they were renumbered and reclassified to Class 10B.