| USRA Light Mikado |
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| Type and origin |
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| Power type | Steam |
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| Builder | ALCO, Baldwin, Lima |
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| Build date | 1918-1929 |
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| Total produced | 614 originals plus 641 copies |
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| Specifications |
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Configuration:
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| • Whyte | 2-8-2 |
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| • UIC | 1′D1′ h2 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Leading dia. | 33 in (0.838 m) |
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| Driver dia. | 63 in (1.600 m) |
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| Trailing dia. | 43 in (1.092 m) |
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| Wheelbase | locomotive: 36 ft 1 in (11.00 m)
+ tender: 71 ft 4+1⁄2 in (21.76 m) |
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| Adhesive weight | 220,000 lb (99,800 kg) |
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| Loco weight | 292,000 lb (132,000 kilograms; 132 metric tons) |
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| Tender weight | 185,400 lb (84,100 kilograms; 84.1 metric tons) |
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| Total weight | 477,400 lb (216,500 kilograms; 216.5 metric tons) |
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| Fuel type | Coal |
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| Fuel capacity | 16 t (15.7 long tons; 17.6 short tons) |
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| Water cap. | 10,000 US gal (38,000 L; 8,300 imp gal) |
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| Firebox: | |
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| • Grate area | 6.2 m2 (67 sq ft) |
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| Boiler pressure | 200 psi (1.38 MPa) |
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| Heating surface | 433.39 m2 (4,665.0 sq ft) |
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Superheater:
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| • Heating area | 81.94 m2 (882.0 sq ft) |
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| Cylinders | Two |
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| Cylinder size | 26 in × 30 in (660 mm × 762 mm) |
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| Valve gear | Walschaerts |
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| Performance figures |
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| Maximum speed | 65 mph (105 km/h) |
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| Power output | 2,991 hp (2,230 kW) |
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| Tractive effort | 54,724 lbf (243.42 kN) |
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| Career |
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| Preserved | 6 original and 3 copies preserved |
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The USRA Light Mikado 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 2-8-2 wheel arrangement in the Whyte notation, or 1′D1′ in UIC classification.
A total of 614 locomotives were built under the auspices of the USRA, with a further 641 copies built after the end of the USRA's control. The first, for the Baltimore and Ohio Railroad, was completed in July 1918 and given #4500. The locomotives were considered well designed and modern, and were popular and successful. Large numbers remained in service until replaced by diesel locomotives. It was also called the McAdoo Mikado after William Gibbs McAdoo, head of the USRA.
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