 Although the South African Railways and Harbours came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways was only implemented with effect from 1 January 1912.In 1912, these engines were designated Class A and were renumbered in the range from 97 to 196, with the unmodified Class D1 locomotives receiving the numbers in the range from 97 to 186 and the ten, at the time, already reboilered Class D2 locomotives receiving the numbers in the range from 187 to 196.In South African Railways (SAR) service, the Improved Dübs A locomotives became known as the Class A Belpaire.