. ▁When ▁these ▁locomot ives ▁were ▁assim il ated ▁into ▁the ▁South ▁African ▁Rail ways ▁in ▁ 1 9 1 2 , ▁they ▁were ▁ren umber ed ▁but ▁retained ▁their ▁Class ▁ 1 1 ▁classification . ▁ ▁Man ufact urer ▁Bu ilt ▁by ▁the ▁North ▁British ▁Lo comot ive ▁Company ▁( N BL ), ▁the ▁Class ▁ 1 1 ▁was ▁designed ▁for ▁goods ▁train ▁service ▁on ▁the ▁Re ef ▁by ▁P . A . ▁Hy de , ▁Chief ▁Lo comot ive ▁Super int endent ▁of ▁the ▁Central ▁South ▁African ▁Rail ways ▁( CS AR ) ▁from ▁ 1 9 0 2 ▁to ▁ 1 9 0 4 . ▁One ▁locomot ive , ▁CS AR ▁no . ▁ 7 0 0 , ▁was ▁delivered ▁early ▁in ▁ 1 9 0 4 ▁for ▁trial ▁purposes . ▁After ▁successful ▁tri als , ▁this ▁locomot ive ▁was ▁followed ▁by ▁a ▁further ▁ 3 5 ▁Class ▁ 1 1 ▁locomot ives ▁which ▁were ▁delivered ▁later ▁that ▁same ▁year ▁and ▁number ed ▁in ▁the ▁range ▁from ▁ 7 0 1 ▁to ▁ 7 3 5 . ▁ ▁Character istics ▁The ▁Class ▁ 1 1 ▁was ▁designed ▁by ▁Hy de ▁to ▁take ▁full ▁advantage ▁of ▁the ▁new ▁ ▁track ▁of ▁the ▁CS AR ▁which ▁was ▁gradually ▁replacing ▁the ▁old ▁ ▁sections ▁on ▁main lines . ▁Upon ▁delivery , ▁however , ▁the ▁class ▁was ▁found ▁to ▁be ▁too ▁heavy ▁for ▁a ▁large ▁part ▁of ▁the ▁existing ▁track ▁and ▁brid ges ▁on ▁the ▁line ▁between ▁Wit bank ▁and ▁Germ ist on ,