Southern Pacific 4294

Specifications
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)(boiler empty 576,800 lb)
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
Cylinders	Four (simple articulated)
Cylinder size	24 in × 32 in (610 mm × 810 mm) dia × stroke
Valve gear	Walschaerts
Valve type	dual piston "spool"

Type and origin
Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	70101
Build date	March 1944

Southern Pacific 4294
Southern Pacific 4294
	SP No. 4294 on static display at the California State Railroad Museum in 2024
Power type
Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	70101
Build date	March 1944
Configuration:;
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)(boiler empty 576,800 lb)
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
Cylinders	Four (simple articulated)
Cylinder size	24 in × 32 in (610 mm × 810 mm) dia × stroke
Valve gear	Walschaerts
Valve type	dual piston "spool"
Maximum speed
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
Operators
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 static display

Southern Pacific 4294 is a AC-12 class 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 (BLW) in March 1944 and was used hauling Southern Pacific Railroad's (SP) 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.