| Atchison, Topeka & Santa Fe 2900 Class |
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Eastbound freight on the Santa Fe pulled by Santa Fe 2914 on August 22, 1952. |
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| Specifications |
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Configuration:
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| • Whyte | 4-8-4 |
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| • UIC | 2′D2′ h2 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Driver dia. | 80 in (2,032 mm) |
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| Length | 120 ft 10 in (36.83 m) |
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| Axle load | 77,500 lb (35,200 kg) |
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| Adhesive weight | 293,860 lb (133,290 kg) |
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| Loco weight | 510,150 lb (231,400 kg) |
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| Tender weight | 464,700 lb (210,800 kg) |
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| Total weight | 974,850 lb (442,180 kg) |
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| Fuel type | Oil |
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| Fuel capacity | 7,000 US gal (26,000 L; 5,800 imp gal) |
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| Water cap. | 24,500 US gal (93,000 L; 20,400 imp gal) |
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| Firebox: | |
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| • Grate area | 108 sq ft (10.0 m2) |
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| Boiler | 102 in (2,591 mm) |
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| Boiler pressure | 300 lbf/in2 (2.1 MPa) |
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| Cylinders | 2 |
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| Cylinder size | 28 in × 32 in (711 mm × 813 mm) |
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| Valve gear | Walschaert |
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| Valve type | Piston valves |
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| Performance figures |
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| Maximum speed | 120 mph (190 km/h) |
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| Power output | 4,590 hp (3,420 kW) @ 40 mph |
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| Tractive effort | 66,000 lbf (293.58 kN) |
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| Factor of adh. | 4.45 |
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| Career |
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| Operators | Santa Fe |
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| Class | 2900 |
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| Numbers | 2900-2929 |
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| Retired | 1953-1959 |
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| Preserved | Six (Nos. 2903, 2912, 2913, 2921, 2925 and 2926) preserved |
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| Disposition | Five on display and one (2926) operational, remainder scrapped |
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The Santa Fe 2900 Class was a series of 30 4-8-4 type steam locomotives built between 1943 and 1944 for Atchison, Topeka and Santa Fe Railroad and pulled freight and passenger trains until retirement in the early to late-1950s.
Today, six 2900s survive, with five units on static display and one, No. 2926, has been restored to operating condition in Albuquerque, New Mexico. When it was fully restored in July 2021, it is considered to be the largest operating 4-8-4 type steam locomotive in the United States.
