Chesapeake and Ohio class H-8

Specifications
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

Type and origin
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

Chesapeake and Ohio H-8 class
Chesapeake and Ohio H-8 class
	Builder's card for the Chesapeake and Ohio's 2-6-6-6 "Allegheny" locomotives.
Power type
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
Configuration:;
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
Maximum speed
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)
Operators
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
	Source:

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.

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