The South Australian Railways Gb Class locomotives were built by Robert Stephenson and Company in 1874 and 1878 for the Glenelg Railway Company, later being acquired by the South Australian Railways (SAR) on 16 December 1899. The engines were sold to the Adelaide Glenelg & Suburban Railway Company as No. 4 and 5, then subsequently sold to the Glenelg Railway Company in November 1881 with the same numbers. When the SAR purchased the Glenelg Railway Company in 1899, they were classed Gb and renumbered 158 and 159. No. 158 was scrapped in December 1904, while No. 159 persisted until 21 February 1916, then ultimately scrapped in 1922.[1][2]

South Australian Railways Gb Class
South Australian Railways Gb Class No. 159
Type and origin Power type Steam Builder Robert Stephenson and Company Serial number 2219, 2327 Build date 1874, 1878 Total produced 2
Specifications Configuration: ​  • Whyte 4-4-0T  • UIC 2'B T Gauge 5 ft 3 in (1,600 mm) Driver dia. 4 ft 0 in (1,219 mm) Length (?) Loco weight 25 long tons 10 cwt (57,100 lb or 25.9 t) Fuel type Coal Fuel capacity 0 long tons 16 cwt (1,800 lb or 0.8 t) Water cap. 460 imp gal (552 US gal; 2,091 L) Firebox:  • Firegrate area 10.5 sq ft (0.98 m2) Boiler pressure 145 psi (1,000 kPa) Heating surface:  • Tubes 547 sq ft (50.8 m2)  • Firebox 56 sq ft (5.2 m2) Cylinders 2 Cylinder size 12 in × 18 in (305 mm × 457 mm)
Performance figures Tractive effort 7,814 lbf (34.76 kN)
Career Operators South Australian Railways Class Gb Number in class 2 Numbers 158 & 159 Withdrawn 1904, 1916 Scrapped 1904, 1922 Disposition Both scrapped

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