 Instead of being led vertically down from the dome directly to the high-pressure cylinders, an internal pipe was taken from the regulator valve in the dome to the superheater in the smokebox, from where it was brought back to the high-pressure cylinders by external steam pipes arranged under the running boards.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.Although the South African Railways and Harbours came into existence in 1910, with Sir William Hoy appointed as its first General Manager, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.