------[INSTRUCTIONS]------ Space - Whistle Right Arrow - Next Livery -------[DESCRIPTION-------- Built between March 1941 and April 1942, the Southern Pacific GS-4-class 4-8-4 Northerns were, and still to this day *are*, the most gorgeous steam locomotives ever built, rivaling the Norfolk & Western Class Js. --------[TECHNICAL OVERVIEW]------ Type and origin Power type Steam Builder Lima Locomotive Works Serial number 7798–7817, 7848–7855 Build date March–May 1941 (20), March–April 1942 (8) Total produced 28 Specifications Configuration: • Whyte 4-8-4 • UIC 2′D2′ h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 36 in (914 mm) Driver dia. 80 in (2,032 mm) Trailing dia. 45+1⁄2 in (1,156 mm) Wheelbase 88.23 ft (26.89 m) Height 16 ft 4 in (4.98 m) Axle load 69,000 lb (31,000 kg; 31 t) Adhesive weight 275,700 lb (125,100 kg; 125.1 t) Loco weight 475,000 lb (215,000 kg; 215 t) Total weight 870,600 lb (394,900 kg; 394.9 t) Fuel type Oil Fuel capacity 5,880 US gal (22,300 L; 4,900 imp gal) Water cap. 23,500 US gal (89,000 L; 19,600 imp gal) Firebox: • Grate area 90.4 sq ft (8.40 m2) Boiler pressure 300 psi (2.07 MPa) Heating surface: • Firebox 385 sq ft (35.8 m2) • Total surface 4,887 sq ft (454.0 m2) Superheater: • Heating area 2,086 sq ft (193.8 m2) Cylinders Two, outside Cylinder size 25+1⁄2 in × 32 in (648 mm × 813 mm) Valve gear Walschaerts Valve type Piston Loco brake Air Train brakes Air Performance figures Maximum speed 120 mph (190 km/h) Tractive effort Engine: 64,800 lbf (288.24 kN) Booster: 13,850 lbf (61.61 kN) Total: 78,650 lbf (349.85 kN) Career Operators Southern Pacific Class GS-4 Numbers 4430–4457 First run April 1941 Retired 1956-1958 Preserved No. 4449 operational in excursion service Scrapped 1956-1959 Disposition One preserved, remainder scrapped
