| South African Class GB 2-6-2+2-6-2 | |
| Hatnote: | ♠ Locomotive no. 2166 Locomotive numbers 2160-2165 |
| Powertype: | Steam |
| Designer: | Beyer, Peacock & Company |
| Builder: | Beyer, Peacock & Company |
| Serialnumber: | 5942, 6181-6186 |
| Buildmodel: | Class GB |
| Builddate: | 1921, 1924 |
| Totalproduction: | 7 |
| Whytetype: | 2-6-2+2-6-2 (Double Prairie) |
| Uicclass: | 1’C1’+1’C1’h4 |
| Driver: | 3rd & 4th coupled axles |
| Leadingdiameter: | NaN0NaN0 |
| Coupleddiameter: | NaN0NaN0 |
| Trailingdiameter: | NaN0NaN0 |
| Wheelbase: | 530NaN0 |
| Engine Total: | ♠ 17feet each 17feet each |
| Coupled: | 80NaN0 each |
| Pivotcentres: | 26feet |
| Over Couplers: | 59feet |
| Height: | 12feet |
| Frametype: | Plate |
| Axleload: | ♠ 7lt 8sigfig=4NaNsigfig=4 |
| Leadingbogie/Pony: | ♠ 6lt front 7lt rear 7lt front 7lt rear |
| Coupled 1: | ♠ 7lt 7lt |
| Coupled 2: | ♠ 7lt 7lt |
| Coupled 3: | ♠ 7lt 7lt |
| Coupled 4: | ♠ 7lt 8sigfig=4NaNsigfig=4 |
| Coupled 5: | ♠ 7lt 8sigfig=4NaNsigfig=4 |
| Coupled 6: | ♠ 7lt 8sigfig=4NaNsigfig=4 |
| Trail Bogie/Pony: | ♠ 6sigfig=4NaNsigfig=4 front 6lt rear 6lt front 7lt rear |
| Weightondrivers: | ♠ 45lt 47lt |
| Locoweight: | ♠ 71lt 76lt |
| Fueltype: | Coal |
| Fuelcap: | 51NaN1 |
| Watercap: | ♠ 1450sigfig=3NaNsigfig=3 front 550sigfig=3NaNsigfig=3 rear 1520sigfig=3NaNsigfig=3 front 800sigfig=3NaNsigfig=3 rear |
| Fireboxtype: | Belpaire |
| Firearea: | ♠ 23square feet |
| Pitch: | 70NaN0 |
| Diameterinside: | 4feet |
| Lengthinside: | ♠ 10feet 10feet |
| Smalltubediameter: | ♠ 128: NaN0NaN0 119: NaN0NaN0 |
| Largetubediameter: | ♠ 21: NaN0NaN0 21: NaN0NaN0 |
| Boilerpressure: | 1800NaN0 |
| Safetyvalvetype: | Ramsbottom |
| Totalsurface: | ♠ 1049square feet 1018square feet |
| Tubearea: | ♠ 944square feet 914square feet |
| Fireboxarea: | ♠ 105square feet 104square feet |
| Superheaterarea: | ♠ 174square feet 203square feet |
| Cylindercount: | Four |
| Cylindersize: | 120NaN0 bore 200NaN0 stroke |
| Valvegear: | Walschaerts |
| Valvetype: | Piston |
| Coupling: | Johnston link-and-pin AAR knuckle (1930s) |
| Tractiveeffort: | 18190lbf @ 75% |
| Operator: | South African Railways |
| Operatorclass: | Class GB |
| Numinclass: | 7 |
| Fleetnumbers: | 1650 renumbered 2166, 2160-2165 |
| Deliverydate: | 1921, 1924 |
| Firstrundate: | 1921 |
| Withdrawndate: | 1967 |
The South African Railways Class GB 2-6-2+2-6-2 of 1921 was an articulated steam locomotive.
In June 1921, the South African Railways placed a single experimental Class GB Garratt articulated steam locomotive with a 2-6-2+2-6-2 Double Prairie type wheel arrangement in service. Six more of these locomotives entered service in 1924.[1]
The first experimental model of eventually seven Class GB branch line Garratt articulated locomotives was one of altogether five Garratts which were ordered by the South African Railways (SAR) from Beyer, Peacock & Company in 1914. The rest of the order consisted of three narrow gauge Class NG G11 2-6-0+0-6-2 locomotives and a single experimental Class GA 2-6-0+0-6-2 mainline locomotive. Production was disrupted by World War I, however, and Beyer, Peacock & Company was only able to deliver the narrow gauge locomotives in 1919 and the two Cape gauge locomotives in 1921, after cessation of hostilities.[1]
The Class GB was numbered 1650, but the engine number was later changed to 2166. The locomotive was erected in the Durban shops and placed in service in June 1921. It was superheated, with a Belpaire firebox, plate frames and Walschaerts valve gear. The boiler was provided with the Gresley type air valve and mechanical lubrication was provided for the coupled wheel axle boxes.[1]
In 1924, six more locomotives of this Class were placed in service, also built by BP and numbered in the range from 2160 to 2165. They embodied all the improvements which experience with the first engine had shown desirable. The main differences between these locomotives and the original were revised boiler proportions and a larger water bunker capacity. The most obvious difference was a more completely enclosed cab with side windows instead of the curved cut-outs in the cab sides of the first locomotive. They were also heavier, 76lt compared to the 71lt of the engine of 1921.[1]
The first locomotive was placed in service 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 3000NaN0 radius.[1]
A couple of the second batch of locomotives joined the first one on the South Coast line for a brief period, but most went directly to the Eastern Cape where they were used on the Port Alfred branch and the Aliwal North to Barkly East line, famous for its reverses and its 1 in 30 (3⅓%) compensated ruling gradients. The Natal locomotives were soon also relocated to work there when the Class GC Garratts replaced them on the South Coast line later in 1924. They remained working on the Barkly East branch until they were withdrawn from service in 1967.