When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (Cape Government Railways, Natal Government Railways and CSAR) were united under a single administration to control and administer the railways, ports and harbours of the Union.
In 1912, these locomotives were renumbered in the range from 767 to 778 and designated Class 10C on the South African Railways (SAR) [REF].