Southern Pacific 4294

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Southern Pacific 4294
SP No. 4294 on static display at the California State Railroad Museum
Type and origin Power type Steam Builder Baldwin Locomotive Works Serial number 70101 Build date March 1944
Specifications Configuration: ​  • Whyte 4-8-8-2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 63.5 in (1,613 mm) Minimum curve 319.62 ft (97.42 m) radius or 18° Wheelbase 112 ft 2 in (34.19 m) (engine 67 ft 0.25 in or 20.43 m)(driver 44 ft 7 in or 13.59 m) Length 123 ft 8 in (37.69 m) (loco 78 ft 11 in or 24.05 m) Width 10 ft 0 in (3.05 m) Height 16 ft 4 in (4.98 m) Adhesive weight 531,700 lb (241,200 kg; 241.2 t) Loco weight 657,900 lb (298,400 kg; 298.4 t)[1] (boiler empty 576,800 lb) [2][page needed] Tender weight 393,300 lb (178,400 kg) (empty 160,000 lb or 73,000 kg) Total weight 1,051,200 lb (476,800 kg) Tender type Rectangular Model 220-R-6 Fuel type Bunker C (#6 fuel oil) Water cap. Boiler 10,935 US gal (41,390 L; 9,105 imp gal) / Nathan 4000-C Non-Lifting Injector 12,000 gal/h (45 m3/h; 10,000 imp gal/h) Tender cap. 6,100 US gal (23,000 L; 5,100 imp gal) Oil 22,000 US gal (83,000 L; 18,000 imp gal) Water Sandbox cap. 2 short tons (1.8 t; 1.8 long tons) to front 3 drivers of both engines Firebox: ​  • Grate area 139 sq ft (12.9 m2) Boiler Diameter 108.125 in (2,746 mm) Boiler pressure 250 psi (1.7 MPa) Feedwater heater Worthington Type 6-SA 12,000 gal/h (45 m3/h; 10,000 imp gal/h) Heating surface: ​  • Firebox 1,700 °F (930 °C)  • Tubes 3,456 sq ft (321.1 m2)  • Flues 1,834 sq ft (170.4 m2)  • Tubes and flues 240 tubes / 91 flues Superheater Elesco Type E Cylinder size 24 in × 32 in (610 mm × 810 mm) dia × stroke Valve gear Walschaerts Valve type dual piston "spool"
Performance figures Maximum speed 63 mph (101 km/h) Power output 6,000 hp (4,500 kW) at 40 mph (64 km/h) Tractive effort 124,300 lbf (553 kN) Factor of adh. 4.28
Career Operators Southern Pacific Railroad Class AC-12 Number in class 20 Numbers SP 4294 Nicknames Cab Forward First run March 19, 1944 Retired March 5, 1956 Restored May 1981 (cosmetically) Current owner The City of Sacramento, California Disposition On indoor static display

Southern Pacific 4294 is a class "AC-12" 4-8-8-2 Cab forward type steam locomotive that was owned and operated by the Southern Pacific Railroad (SP). It was built by the Baldwin Locomotive Works in March 1944 and was used hauling SP's trains over the Sierra Nevada, often working on Donner Pass in California. Today it is preserved at the California State Railroad Museum (CSRM) in Sacramento, California.