Heusinger-Steuerung
The first thirteen Class 19B locomotives were delivered with Walschaerts valve gear, but like Class 16DA no. 879 of the same year, no. 1414 was equipped with Caprotti valve gear as an experiment. In January 1943, after thirteen years in service, the Caprotti rotary cam poppet valve gear was removed at the Uitenhage workshops and replaced with Walschaerts valve gear. The experiment did result in the successor Class 19C being built with rotary cam poppet valve gear.