Milwaukee Road class S3

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Milwaukee Road S3 class
MILW 265 on display in Milwaukee, Wisconsin in early 1966.
Type and origin Power type Steam Builder American Locomotive Company Order number S-1928 Serial number 71973–71982 Build date July–September 1944 Total produced 10
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. 74 in (1,880 mm) Trailing dia. 38 in (965 mm) (lead axle) 44 in (1,118 mm) (trail axle) Wheelbase Loco & tender: 95.54 ft (29.12 m) Length 109 ft 7+3⁄4 in (33.42 m) Height 15 ft 6 in (4.72 m) Axle load 64,825 lb (32.413 short tons) Adhesive weight 259,300 pounds (129.7 short tons) Loco weight 460,000 pounds (230 short tons) Tender weight 364,100 pounds (182.1 short tons) Total weight 824,100 pounds (412.1 short tons) Tender type Water-bottom Fuel type Coal Fuel capacity 25 short tons (23,000 kg) Water cap. 20,000 US gal (76,000 L; 17,000 imp gal) Firebox: ​  • Grate area 96.20 sq ft (8.937 m2) Boiler pressure 250 lbf/in2 (1.72 MPa) Safety valve Pop Cylinders Two Cylinder size 26 in × 32 in (660 mm × 813 mm) Valve gear Walschaert
Performance figures Maximum speed 100 mph (160 km/h) Power output 4,500 hp (3,400 kW) Tractive effort 62,119 lbf (276.32 kN) Factor of adh. 4.17
Career Operators Milwaukee Road Class S3 Numbers 260–269 Retired 1954-1956 Preserved Two (No. 261 and No. 265) Disposition Milwaukee Road 261 in operating condition Milwaukee 265 on display in Union, Illinois Remainder scrapped

The Milwaukee Road S3 Class was a class of 10 4-8-4 "Northern" type steam locomotives built by the American Locomotive Company in 1944 and operated by the Milwaukee Road until the mid 1950s. The locomotives saw service in pulling freight and passenger trains throughout the Milwaukee Road.

Today, two S3s survive, No. 261 is in operating condition and No. 265 is on display in Union, Illinois.