Baltimore and Ohio Class N-1
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| B&O #5600 George H. Emerson | |
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| Baltimore and Ohio Railroad #5600 George H. Emerson | |
| Power type | Steam |
| Builder | B&O Mount Clare Shops |
| Build date | May 1937 |
| Total produced | 1 |
| Configuration | 4-4-4-4 |
| UIC classification | 2′BB2′ |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
36 in (914 mm) |
| Driver diameter | 76 in (1,930 mm) |
| Trailing wheel diameter |
42 in (1,067 mm) |
| Minimum curve | 13° normal, 18° slow |
| Length | 117 ft ¼ in (35.67 m) |
| Weight on drivers | 238,000 lb (108.0 tonnes) |
| Locomotive weight | 386,500 lb (175.3 tonnes) |
| Tender weight | 350,000 lb (158.8 tonnes) |
| Locomotive & tender combined weight |
736,500 lb (334.1 tonnes) |
| Tender type | Vanderbilt with two 3-axle trucks |
| Fuel type | Coal |
| Fuel capacity | 46,000 lb (20.9 tonnes) |
| Water capacity | 22,000 US gal (83,000 l; 18,000 imp gal) |
| Boiler pressure | 350 lbf/in² (2.41 MPa) |
| Firegrate area | 80.5 sq ft (7.48 m2) |
| Heating surface: Tubes and flues |
4,220 sq ft (392 m2) |
| Heating surface: Firebox |
677 sq ft (62.9 m2) |
| Heating surface: Total |
4,897 sq ft (454.9 m2) |
| Superheater type | B&O |
| Superheater area | 1,312 sq ft (121.9 m2) |
| Cylinders | Four, duplex |
| Cylinder size | 18 × 26.5 in (457 × 673 mm) |
| Valve gear | Walschaerts |
| Power output | 3,936 hp (2,935 kW) at cylinders |
| Tractive effort | 65,000 lbf (289.1 kN) |
| Factor of adhesion |
3.66 |
| Career | Baltimore and Ohio Railroad |
| Class | N-1 |
| Number | 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.
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B & O 5600 at the 1939 New York World's Fair
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Detail, showing the rearward cylinders and gear
[edit] References
- Reed, Brian (June 1972). Pennsylvania Duplexii. Loco Profile 24. Windsor, Berkshire: Profile Publications Limited. pp. 266–267.
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