...that after the first South African Railways Class GB 2-6-2+2-6-2 Garratt was placed in service in 1921 working passenger trains on the Natal South Coast line, it proved to be a successful locomotive, having good riding qualities and flexibility on light track with poor ballasting and many curves of 300 feet radius, which led to a second order of six more locomotives of the class to be placed in service in 1924? -