Class GMAM Garratt 4-8-2+2-8-4
Class GMAM Garratt 4-8-2+2-8-4.
Between 1954 and 1956, Beyer Peacock, North British Locomotive and Henschel delivered 150 of this class to the South African Railways. The class consisted of the GMAM, for operation on mainlines as denoted by the M at the end. By moving baffles in the coal tender and water tank, the capacity could be reduced to 11,6 tons of coal and 1650 gallons of water from 14 tons and 2100 gallons for branch line operation, for track laid with 60lb rail. The locomotives were superheated and used the latest technology available at the time with one piece cast steel frames, roller bearing axle boxes, and Walschaerts valve gear. These locomotives always trailed an auxiliary water tank, to increase the distance between water stops. They saw service on most secondary and branch lines around the country. They were the last Garratt’s in service on the SAR, and were still in industrial service up to the end of the 20th Century.
The kit is available in both 16.5mm and 12mm gauge versions. The model faithfully copies the dimensions of the prototype, and can represent either the GMA or the M version. Everything is included in the box to complete an accurate running model. The builder needs to supply a temperature controlled soldering iron, paint and glue. The kit can be built with a basic set of modeling hand tools. The components comprise of white metal casting and etched brass with finely machined axles and bearings etc. The loco is powered by the rear engine unit, using a Mashima can motor and precision 45:1 reduction gearbox. The front engine unit freewheels. The rear engine provides pickup on one side while the front engine picks up the opposite polarity. There is ample room in the boiler/ash pan to fit a sound decoder and speaker. The model is supplied with Kadee No. 5 couplers on the 16.5 mm version and Kadee No. 58’s on the 12mm version. Precision Miniatures recommends that this loco should not be operated on curves of less than 650 mm radius.