Baltimore and Ohio 4500 is a 2-8-2 "USRA Light Mikado" steam locomotive built by the Baldwin Locomotive Works in Philadelphia, Pennsylvania in July 1918 for the Baltimore and Ohio Railroad (B&O) as a member of the Q-3 class.
Quick Facts Type and origin, Power type ...
Baltimore and Ohio 4500 |
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B&O 4500 as it was built in 1918 |
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Specifications |
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Configuration:
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• Whyte | 2-8-2 |
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• UIC | 1′D2′ h1 |
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Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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Leading dia. | 33 in (838 mm) |
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Driver dia. | 63 in (1,600 mm) |
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Trailing dia. | 43 in (1,092 mm) |
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Wheelbase | Loco & tender: 41.98 ft (12.80 m) |
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Axle load | 55,200 lb (25,000 kilograms; 25.0 metric tons) |
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Adhesive weight | 220,000 lb (100,000 kilograms; 100 metric tons) |
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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 (16 long tons; 18 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 | 66.70 sq ft (6.197 m2) |
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Boiler pressure | 200 lbf/in2 (1.38 MPa) |
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Heating surface: | |
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• Firebox | 286 sq ft (26.6 m2) |
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Superheater:
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• Heating area | 882 sq ft (81.9 m2) |
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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 | Walschaert |
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The locomotive hauled freight for the B&O until retirement in August 1957 and was donated for display at the B&O Railroad Museum in Baltimore, Maryland. It is the sole surviving Baltimore and Ohio Mikado type steam locomotive.