Northern Pacific class S-10

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NP S-10 Class
NP 328 in the Jackson Street Roundhouse, November 2015
Type and origin Power type Steam Builder Alco (Rogers) Build date 1905-1907 Total produced 20
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2'C Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 30 in (762 mm) Driver dia. 57 in (1,448 mm) Wheelbase 21 ft 1 in (6.426 m) Length 58 ft 6 in (17.831 m) Height 14 ft 10+1⁄4 in (4.528 m) Adhesive weight 115,000 lb (52 t) Loco weight 153,000 lb (69 t) Tender weight 104,000 lb (47 t) Fuel type Coal Water cap. 5,500 US gal (21,000 L; 4,600 imp gal) Firebox: ​  • Grate area 38.5 square feet (3.58 m2) Boiler pressure 190 lbf/in2 (1.31 MPa) Heating surface: ​  • Tubes and flues 1,865 square feet (173.3 m2)  • Total surface 2,010 square feet (187 m2) Cylinders Two, simple Cylinder size 19 in × 26 in (483 mm × 660 mm) Valve gear Stephenson Loco brake Air Train brakes Air
Performance figures Tractive effort 26,600 lbf (118 kN)
Career Operators Northern Pacific Railway Class S-10 Numbers 320-329 Locale Montana, North Dakota, Minnesota, Wisconsin Withdrawn 1928-1950 Preserved 328

The Northern Pacific class S-10 (NP S-10)^[1] was a type of steam locomotive in use on American railroads in the early 20th century. The first engines of the type were introduced in 1905, and ten were acquired by the Northern Pacific Railway (NP) in 1907, continuing in service until the 1930s and 1940s. One of the engines, Specifically No.328, has been preserved.