USRA Light Mikado
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| Type and origin | |
|---|---|
| Power type | Steam |
| Builder | ALCO, Baldwin, Lima |
| Total produced | 625 originals plus 641 copies |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 2-8-2 |
| • UIC | 1′D1′ h2 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Leading dia. | 33 in (0.838 m) |
| Driver dia. | 63 in (1.600 m) |
| Trailing dia. | 43 in (1.092 m) |
| Wheelbase |
locomotive: 36 ft 1 in (11.00 m) + tender: 71 ft 4 1⁄2 in (21.76 m) |
| Adhesive weight | 220,000 lb (99,800 kg) |
| Loco weight | 292,000 lb (132,000 kg) |
| Fuel type | Coal |
| Boiler pressure | 200 psi (1.38 MPa) |
| Cylinders | Two |
| Cylinder size | 26 in × 30 in (660 mm × 762 mm) |
| Valve gear | Walschaerts |
| Performance figures | |
|---|---|
| Tractive effort | 54,724 lbf (243.42 kN) |
| Career | |
|---|---|
| Preserved | 7 |
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 625 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.
With later copies, over 50 railroads used the type, including the following:
Copies:
7 USRA light mikados both originals and copies are preserved. These are Frisco 4003 at the Fort Smith Trolley Museum in Fort Smith, Arkansas, Frisco 4018 at the Sloss Furness in Birmingham, Alabama, Nickel Plate Road 587 at the Indiana Transportation Museum in Noblesville, Indiana, Baltimore and Ohio 4500 at the B&O Railroad Museum in Baltimore, Maryland, Grand Trunk Western 4070 at Midwest Railway Preservation Society in Cleveland, Ohio, Union Pacific 2537 at Jefferson Park in Walla Walla, Washington, and C&IM 551 at the St Louis Transportation museum.
LGB produced a Light Mikado from 2001-2004 in G scale in multiple fallen flag railroad names.
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Wikipedia