USRA Light Mountain

Type and origin
Power type	Steam
Builder	American Locomotive Company Baldwin Locomotive Works
Total produced	47 (plus copies)

Specifications
Configuration	4-8-2
UIC class	2′D1′ h2
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Driver diameter	69 in (1.753 m)
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)
Loco & tender 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: • Firegrate area	70.8 sq ft (6.58 m²)
Boiler pressure	200 lbf/in² (1,380 kPa; 14.1 kgf/cm²)
Heating surface	4,130 sq ft (384 m²)
• Tubes	2,598 sq ft (241.4 m²)
• Flues	1,176 sq ft (109.3 m²)
• Firebox	329 sq ft (30.6 m²)
Superheater: • Heating area	957 sq ft (88.9 m²)
Cylinders	Two
Cylinder size	27 in × 30 in (686 mm × 762 mm)
Valve gear	Walschaerts
Valve type	14-inch (356 mm) piston valvles

Performance figures
Tractive effort	53,900 lbf (239.76 kN)
Factor of adh	4.1

Career
Preserved	None

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

URSA originals

Railroad	Quantity	Class	Road numbers	Notes
Missouri Pacific Railroad	7	MT-69	5301–5307
Nashville, Chattanooga and St. Louis Railway	5	J1-54	550–554
New York, New Haven and Hartford Railroad	10	R-1	3300–3309
Southern Railway	25	Ts-1	1475–1499	3 to AGS 6692–6694, 5 to CNOTP 6495–6499
Total	47

Copies

Railroad	Quantity	Class	Road numbers
Louisville and Nashville Railroad	22	L-1	400–421
Nashville, Chattanooga and St. Louis Railway	8	J1-54	555–562
New York, New Haven and Hartford Railroad	30	R-1-a	3310–3339
New York, New Haven and Hartford Railroad	9	R-1-b	3304–3348
New York, Ontario and Western Railway
Minneapolis, St. Paul and Sault Ste. Marie Railroad (Soo Line)	21	N-20	4000–4020
Total	90

None of the originals built under USRA auspices or any of the subsequent copies were preserved.

References

Drury, George H. (1983), Guide to North American Steam Locomotives, Waukesha, Wisconsin: Kalmbach Publishing Company, ISBN 0-89024-206-2, LCCN 93041472
Edson, William D.; Corley, Raymond F. "Locomotives of the Grand Trunk Railway". Railroad History (Boston, MA: The Railway and Locomotive Historical Society, Inc.) (147). ISSN 0090-7847.

Huddleston, Eugene L. (2002). Uncle Sam's Locomotives: The USRA and the Nation's Railroads. Bloomington, Indiana: Indiana University Press. ISBN 0-253-34086-1.
Westcott, Linn H. (1960). Model Railroader Cyclopedia, Volume 1: Steam Locomotives. Milwaukee, Wisconsin: Kalmbach Publishing Co. ISBN 0-89024-001-9.

USRA locomotives

Switchers	0-6-0 0-8-0

Light	2-8-2 2-10-2 4-6-2 4-8-2

Heavy	2-8-2 2-10-2 4-6-2 4-8-2

Articulated	2-6-6-2 2-8-8-2

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