| B&O #5600 George H. Emerson |
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| Type and origin |
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| Power type | Steam |
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| Builder | B&O Mount Clare Shops |
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| Build date | May 1937 |
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| Total produced | 1 |
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| Specifications |
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Configuration:
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| • Whyte | 4-4-4-4 |
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| • UIC | 2′BB2′ |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Leading dia. | 36 in (914 mm) |
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| Driver dia. | 76 in (1,930 mm) |
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| Trailing dia. | 42 in (1,067 mm) |
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| Minimum curve | 13° or 441.68 ft (134.62 m) normal,
18° or 319.62 ft (97.42 m) slow |
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| Length | 117 ft 0+1⁄4 in (35.67 m) |
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| Adhesive weight | 238,000 lb (108,000 kilograms; 108 metric tons) |
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| Loco weight | 386,500 lb (175,300 kilograms; 175.3 metric tons) |
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| Tender weight | 350,000 lb (160,000 kilograms; 160 metric tons) |
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| Total weight | 736,500 lb (334,100 kilograms; 334.1 metric tons) |
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| Tender type | Vanderbilt with two 3-axle trucks |
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| Fuel type | Coal |
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| Fuel capacity | 46,000 lb (21,000 kilograms; 21 metric tons) |
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| Water cap. | 22,000 US gal (83,000 L; 18,000 imp gal) |
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| Firebox: | |
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| • Grate area | Unknown |
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| Boiler pressure | 350 lbf/in2 (2.41 MPa) |
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| Heating surface: | |
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| • Firebox | 677 sq ft (62.9 m2) |
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| • Tubes and flues | 4,220 sq ft (392 m2) |
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| • Total surface | 4,897 sq ft (454.9 m2) |
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Superheater:
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| • Type | B&O |
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| • Heating area | 1,312 sq ft (121.9 m2) |
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| Cylinders | Four, duplex |
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| Cylinder size | 18 in × 26.5 in (457 mm × 673 mm) |
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| Valve gear | Walschaerts |
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The Baltimore and Ohio class N-1 steam locomotive, #5600 (named "George H. Emerson"), was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was unique in the fact that it had a water tube firebox, which was much larger than a normal firebox. It was designed and built by the railroad's own shops in 1937.
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