Milwaukee Road class S3

Specifications
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

Type and origin
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

Milwaukee Road S3 class
Milwaukee Road S3 class
	MILW 265 on display in Milwaukee, Wisconsin in early 1966.
Power type
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
Configuration:;
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
Maximum speed
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
Operators
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.