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USRA Light Mountain 4-8-2 Steam Locomotive
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.

List of Original Owners

Missouri Pacific Railroad

Quantity: 7
Class: MT-69
Road numbers: 5301–5307

Nashville, Chattanooga and St. Louis Railway

Quantity: 5
Class: J1-54
Road numbers: 550–554

New York, New Haven and Hartford Railroad

Quantity: 10
Class: R-1
Road numbers: 3300–3309

Southern Railway

Quantity: 25
Class: Ts-1
Road numbers: 1475–1499
Notes: 3 to AGS 6692–6694, 5 to CNOTP 6495–6499.

Total: 47

Copies

Louisville and Nashville Railroad

Quantity: 22
Class: L-1
Road numbers: 400–421

Nashville, Chattanooga and St. Louis Railway

Quantity: 8
Class: J1-54
Road numbers: 555–562

New York, New Haven and Hartford Railroad

Quantity: 30
Class: R-1-a
Road numbers: 3310–3339

New York, New Haven and Hartford Railroad

Quantity: 9
Class: R-1-b
Road numbers: 3304–3348

Minneapolis, St. Paul and Sault Ste. Marie Railroad (Soo Line)

Quantity: 21
Class: N-20
Road numbers: 4000–4020

Total: 90

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

USRA Light Mountain Overview
Type and origin
Power: type Steam
Builders:
American Locomotive Company, Baldwin Locomotive Works
Total produced: 47 (plus 90 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)
Wheelbase: Locomotive: 40 ft 0 in (12.19 m)
Wheelbase: Locomotive and 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)
Locomotive 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 capacity: 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 adhesion: 4.1
Career
Preserved: None

See also:

USRA Heavy Mountain

4-8-2 Mountain Locomotives

Steam Locomotives

Locomotives

Southern Railway Light Mountain No. 1467.

A USRA Light Mountain Slideshow.

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