The sole member of the SAR class GG was a Double Prairie Garratt built for fast passenger service in the Touws River area. For this task it had the largest drivers yet seen on a Garratt in South Africa with 57 inches. A coal pusher was installed in the tender to ease the work of the fireman or 1,448 mm. It could reach a speed of 57 mph or 92 km/h, but at speed its running was somewhat unsteady due to the single leading axle. So it had to give way to 4-8-2 locomotives and was usually only used for slower passenger and freight trains. On an incline of 1 in 80 (1.25%) it could haul 1,245 tons, what was reduced to 340 tons on 1 in 40 (2.5%). It was withdrawn from active service in 1938 and scrapped nine years later.