Who designed the South African Class 15E 4-8-2 locomotive?

The Class 15E 4-8-2 Mountain type mixed traffic steam locomotive was a refinement of the Classes 15C and 15CA. It was designed by A.G. Watson, Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1929 to 1936, and incorporated many of the improvements which had been developed by him, some of which were a vastly enlarged standardised boiler, a large and wide fire grate and a Watson cab.[1][2]

The designer of the South African Class 15E 4-8-2 locomotive was A.G. Watson, Chief Mechanical Engineer of the South African Railways.