Chesapeake and Ohio class H-8

Chesapeake and Ohio H-8 class
Builder's card for the Chesapeake and Ohio's 2-6-6-6 "Allegheny" locomotives.
Type and origin Power type Steam Designer Advisory Mechanical Committee Builder Lima Locomotive Works Order number 1154, 1162, 1182, 1188, 1205 Serial number 7820–7829, 7883–7892, 8613–8622, 8799–8813 Model H-8 Build date 1941–1944 (1600-1644) 1948 (1645-1659) Total produced 60
Specifications Configuration: ​  • Whyte 2-6-6-6 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 36 in (914 mm) Driver dia. 67 in (1,702 mm) Trailing dia. 36 in (914 mm) (lead & intermediate axle) 43 in (1,092 mm) (trail axle) Tender wheels 36 in (914 mm) Minimum curve 319 ft 7+1⁄2 in (97.42 m) radius/ 18° Wheelbase Locomotive: 62 ft 6 in (19.05 m) Overall: 112 ft 11 in (34.42 m) Length Locomotive: 76 ft 8+3⁄8 in (23.38 m) Overall: 125 ft 7+7⁄8 in (38.30 m) Width 11 ft 1 in (3.38 m) Height 16 ft 7 in (5.05 m) Frame type Cast Steel Axle load 86,700 lb (43.4 short tons) (1600-1644) 85,480 lb (42.74 short tons) (1645-1659) Adhesive weight 507,900 lb (254.0 short tons) (1600-1644) 504,010 lb (252.01 short tons) (1645-1659) Loco weight 771,300 lb (385.7 short tons) (1600-1644) 751,830 lb (375.92 short tons) (1645-1659) Tender weight 426,100 lb or 431,700 lb (25-RB) 437,600 lb (25-RA) Total weight 1,183,540 to 1,208,900 lb (592 to 604 short tons) Tender type 25-RA (1607-1609) 25-RB (remaining) Fuel type Coal Fuel capacity 25 tons (50,000 lb) Water cap. 25,000 US gal (95,000 L) Sandbox cap. 12,000 lb (6 short tons) Fuel consumption Up to 8 short tons of coal / hr Up to 14,000 US gal of water / hr Firebox: ​  • Grate area 135.20 sq ft (12.560 m2) Boiler: ​  • Model Fire Tube  • Diameter 109 in (2,769 mm)  • Tube plates 23 ft (7 m) Boiler pressure 260 lbf/in2 (1.79 MPa) Safety valve Pop, 3+1⁄2 in (89 mm) 4 per locomotive Feedwater heater Worthington SA 14,400 or 16,200 US gal/hr cap Heating surface: ​  • Firebox 600 sq ft (56 m2)  • Tubes and flues 6,478 sq ft (602 m2) (1600-1644) 6,033 sq ft (560 m2) (1645-1659)  • Total surface 7,240 sq ft (673 m2) (1600-1644) 6,795 sq ft (631 m2) (1645-1659) Superheater: ​  • Type Type E  • Heating area 3,186 sq ft (296 m2) (1600-1644) 2,922 sq ft (271 m2) (1645-1659) Cylinders Four Cylinder size 22.5 in × 33 in (572 mm × 838 mm) Valve gear Baker-long travel Valve type Piston valves Valve travel 8 in (203 mm) Valve lap 1+7⁄16 in (37 mm) Valve lead 3⁄16 in (5 mm) Train heating Steam heat Loco brake Pneumatic, Schedule 8-ET Train brakes Pneumatic
Performance figures Maximum speed 70 mph (110 km/h) Power output 6,500–7,500 hp (4,800–5,600 kW) @ ~46 mph (74 km/h) (drawbar) Tractive effort 110,211 lbf (490.24 kN) Factor of adh. 4.61 (1600-1644) 4.57 (1645-1659)
Career Operators Chesapeake and Ohio Class H-8 Numbers 1600–1659 Nicknames Allegheny Retired 1952–1956 Preserved 1601, 1604 Disposition Nos. 1601 and 1604 on display, remainder scrapped
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The Chesapeake and Ohio class H-8 was a class of 60 simple articulated 2-6-6-6 steam locomotives built by the Lima Locomotive Works in Lima, Ohio between 1941 and 1948, operating until the mid 1950s. The locomotives were among the most powerful steam locomotives ever built and hauled fast, heavy freight trains for the railroad. Only two units were preserved; Nos. 1601 and 1604.