Baltimore and Ohio Class N-1
Baltimore and Ohio Railroad #5600 George H. Emerson
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| Type and origin | |
|---|---|
| Power type | Steam |
| Builder | B&O Mount Clare Shops |
| Build date | May 1937 |
| Total produced | 1 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 4-4-4-4 |
| • UIC | 2′BB2′ |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Leading dia. | 36 in (914 mm) |
| Driver dia. | 76 in (1,930 mm) |
| Trailing dia. | 42 in (1,067 mm) |
| Minimum curve |
13° or 441.68 ft (134.62 m) normal, 18° or 319.62 ft (97.42 m) slow |
| Length | 117 ft 0 1⁄4 in (35.67 m) |
| Adhesive weight | 238,000 lb (108,000 kilograms; 108 metric tons) |
| Loco weight | 386,500 lb (175,300 kilograms; 175.3 metric tons) |
| Tender weight | 350,000 lb (160,000 kilograms; 160 metric tons) |
| Total weight | 736,500 lb (334,100 kilograms; 334.1 metric tons) |
| Tender type | Vanderbilt with two 3-axle trucks |
| Fuel type | Coal |
| Fuel capacity | 46,000 lb (21,000 kilograms; 21 metric tons) |
| Water cap | 22,000 US gal (83,000 l; 18,000 imp gal) |
| Firebox: • Firegrate area |
80.5 sq ft (7.48 m2) |
| Boiler pressure | 350 lbf/in2 (2.41 MPa) |
| Heating surface | 4,897 sq ft (454.9 m2) |
| • Tubes and flues | 4,220 sq ft (392 m2) |
| • Firebox | 677 sq ft (62.9 m2) |
| Superheater: |
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| • Type | B&O |
| • Heating area | 1,312 sq ft (121.9 m2) |
| Cylinders | Four, duplex |
| Cylinder size | 18 in × 26.5 in (457 mm × 673 mm) |
| Valve gear | Walschaerts |
| Performance figures | |
|---|---|
| Power output | 3,936 hp (2,935 kW) at cylinders |
| Tractive effort | 65,000 lbf (289.1 kN) |
| Factor of adh. | 3.66 |
| Career | |
|---|---|
| Operators | Baltimore and Ohio Railroad |
| Class | N-1 |
| Numbers | 5600 |
| Official name | George H. Emerson |
| Retired | 1943 |
| Scrapped | October 1950 |
The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This allowed the locomotive's wheelbase to remain the same. The space beside the firebox was hot and dirty, which caused premature cylinder wear, and the placement of the cylinders limited the size of the firebox. These same problems occurred on the PRR Q1, which also placed the rear cylinders by the firebox.
B & O 5600 at the 1939 New York World's Fair
Detail, showing the rearward cylinders and gear
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Wikipedia