USRA Light Mountain

Specifications
Specifications
Configuration:;
• Whyte	4-8-2
• UIC	2′D1′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	69 in (1,753 mm)
Wheelbase	Coupled: 18 ft 3 in (5.56 m); Locomotive: 40 ft 0 in (12.19 m); Loco & tender: 75 ft 8+1⁄2 in (23.08 m);
Axle load	55,000 lb (24,900 kg)
Adhesive weight	220,000 lb (99,800 kg)
Loco weight	320,000 lb (145,100 kg)
Tender weight	172,000 lb (78,000 kg)
Total weight	492,000 lb (223,200 kg)
Fuel type	Coal
Fuel capacity	32,000 lb (14,500 kg)
Water cap.	10,000 US gal (37,900 L; 8,300 imp gal)
Firebox:
• Grate area	70.8 sq ft (6.58 m2)
Boiler pressure	200 psi (1.38 MPa)
Heating surface:
• Firebox	329 sq ft (30.6 m2)
• Tubes	2,598 sq ft (241.4 m2)
• Flues	1,176 sq ft (109.3 m2)
• Total surface	4,130 sq ft (384 m2)
Superheater:;
• Heating area	957 sq ft (88.9 m2)
Cylinders	Two
Cylinder size	27 in × 30 in (686 mm × 762 mm)
Valve gear	Baker, then Walschaerts
Valve type	14-inch (356 mm) piston valves

Type and origin
Type and origin
Power type	Steam
Builder	American Locomotive Company; Baldwin Locomotive Works;
Build date	1918-1930
Total produced	47 (90 plus copies)

USRA Light Mountain
USRA Light Mountain
Power type
Type and origin
Power type	Steam
Builder	American Locomotive Company; Baldwin Locomotive Works;
Build date	1918-1930
Total produced	47 (90 plus copies)
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-2
• UIC	2′D1′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	69 in (1,753 mm)
Wheelbase	Coupled: 18 ft 3 in (5.56 m); Locomotive: 40 ft 0 in (12.19 m); Loco & tender: 75 ft 8+1⁄2 in (23.08 m);
Axle load	55,000 lb (24,900 kg)
Adhesive weight	220,000 lb (99,800 kg)
Loco weight	320,000 lb (145,100 kg)
Tender weight	172,000 lb (78,000 kg)
Total weight	492,000 lb (223,200 kg)
Fuel type	Coal
Fuel capacity	32,000 lb (14,500 kg)
Water cap.	10,000 US gal (37,900 L; 8,300 imp gal)
Firebox:
• Grate area	70.8 sq ft (6.58 m2)
Boiler pressure	200 psi (1.38 MPa)
Heating surface:
• Firebox	329 sq ft (30.6 m2)
• Tubes	2,598 sq ft (241.4 m2)
• Flues	1,176 sq ft (109.3 m2)
• Total surface	4,130 sq ft (384 m2)
Superheater:;
• Heating area	957 sq ft (88.9 m2)
Cylinders	Two
Cylinder size	27 in × 30 in (686 mm × 762 mm)
Valve gear	Baker, then Walschaerts
Valve type	14-inch (356 mm) piston valves
Tractive effort
Performance figures
Tractive effort	53,900 lbf (239.76 kN)
Factor of adh.	4.1
Scrapped
Career
Scrapped	1943-1959
Disposition	All scrapped

The USRA Light Mountain was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. This was the standard light freight locomotive of the USRA types, and was of 4-8-2 wheel arrangement in the Whyte notation, or 2′D1′ in UIC classification.

A total of 47 locomotives were built under the auspices of the USRA.

Original owners

Railroad	Quantity	Class	Road numbers	Notes
Missouri Pacific Railroad	7	MT-69	5301–5307	Built 1919 by ALCO. All scrapped, 1943-1947.
Nashville, Chattanooga and St. Louis Railway	5	J1-54	550–554	Built 1919 by ALCO-Richmond. All scrapped, 1945-1949.
New York, New Haven and Hartford Railroad	10	R-1	3300–3309	Built 1919 by ALCO-Schenectady. All scrapped, 1949-1951.
Southern Railway	25	Ts-1	1475–1499	Built 1919 by ALCO. Three to AGS 6692–6694, five to CNOTP 6495–6499. All scrapped, 1950-1955.
Total	47

Railroad	Quantity	Class	Road numbers	Notes
Louisville and Nashville Railroad	22	L-1	400–421	Built 1926-1930 by Baldwin . All Scrapped 1953-1957
Nashville, Chattanooga and St. Louis Railway	8	J1-54	555–562	Built 1922 by Baldwin. All scrapped, 1955-1956.
New York, New Haven and Hartford Railroad	30	R-1-a	3310–3339	Built 1919 by ALCO. All scrapped, 1943-1958.
New York, New Haven and Hartford Railroad	9	R-1-b	3304–3348	Built 1918-1919 by ALCO. All scrapped, 1943-1945.
New York, Ontario and Western Railway
Minneapolis, St. Paul and Sault Ste. Marie Railroad (Soo Line)	21	N-20	4000–4020	Built 1926-1930 by ALCO and Soo Line. All scrapped, 1944-1959.
Total	90

None of the originals built by the USRA or any of the subsequent copies were preserved, being scrapped from 1943 to 1959.

Drury, George H. (1993), Guide to North American Steam Locomotives, Waukesha, Wisconsin: Kalmbach Publishing Company, ISBN 0-89024-206-2, LCCN 93041472
Edson, William D.; Corley, Raymond F. (Autumn 1982). "Locomotives of the Grand Trunk Railway". Railroad History. 147 (147). Boston, Mass.: Railway and Locomotive Historical Society: 42–183. JSTOR 43520915.
Huddleston, Eugene L. (2002). Uncle Sam's Locomotives: The USRA and the Nation's Railroads. Bloomington, Ind.: Indiana University Press. ISBN 0-253-34086-1.
Westcott, Linn H. (1960). Model Railroader Cyclopedia, Volume 1: Steam Locomotives. Milwaukee, Wis.: Kalmbach Publishing Co. ISBN 0-89024-001-9.

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