Specifications |
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Configuration:
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• Whyte | 2-8-2+2-8-2 (Double Mikado) |
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• UIC | 1'D1'+1'D1'h4 |
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Driver | 3rd & 5th coupled axles |
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Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
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Leading dia. | 28+1⁄2 in (724 mm) |
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Coupled dia. | 45+1⁄2 in (1,156 mm) as built 46 in (1,168 mm) retyred |
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Trailing dia. | 28+1⁄2 in (724 mm) |
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Wheelbase | 70 ft (21,336 mm) |
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• Engine | ♠ 22 ft 10+1⁄2 in (6,972 mm) each ♥ 22 ft 11 in (6,985 mm) each |
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• Coupled | 12 ft 9 in (3,886 mm) each |
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Pivot centres | 35 ft (10,668 mm) |
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Length:
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• Over couplers | ♠ 76 ft 8+3⁄4 in (23,387 mm) ♥ 76 ft 8+1⁄4 in (23,374 mm) |
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Height | 12 ft 11+11⁄16 in (3,954 mm) |
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Frame type | Plate |
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Axle load | ♠ 13 LT 9 cwt (13,670 kg) ♥ 13 LT 3 cwt (13,360 kg) |
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• Leading | ♠ 11 LT 4 cwt (11,380 kg) front 11 LT (11,180 kg) rear ♥ 11 LT 2 cwt (11,280 kg) front 11 LT 10 cwt (11,680 kg) rear |
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• 1st coupled | ♠ 12 LT 6 cwt (12,500 kg) ♥ 12 LT 3 cwt (12,340 kg) |
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• 2nd coupled | ♠ 13 LT 1 cwt (13,260 kg) ♥ 13 LT 3 cwt (13,360 kg) |
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• 3rd coupled | ♠ 12 LT 19 cwt (13,160 kg) ♥ 13 LT 1 cwt (13,260 kg) |
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• 4th coupled | ♠ 12 LT 19 cwt (13,160 kg) ♥ 13 LT 1 cwt (13,260 kg) |
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• 5th coupled | ♠ 13 LT 7 cwt (13,560 kg) ♥ 12 LT 18 cwt (13,110 kg) |
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• 6th coupled | ♠ 13 LT 7 cwt (13,560 kg) ♥ 12 LT 18 cwt (13,110 kg) |
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• 7th coupled | ♠ 13 LT 9 cwt (13,670 kg) ♥ 13 LT (13,210 kg) |
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• 8th coupled | ♠ 12 LT 2 cwt (12,290 kg) ♥ 12 LT 11 cwt (12,750 kg) |
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• Trailing | ♠ 11 LT 3 cwt (11,330 kg) front 11 LT 11 cwt (11,740 kg) rear ♥ 11 LT 7 cwt (11,530 kg) front 11 LT 4 cwt (11,380 kg) rear |
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Adhesive weight | ♠ 103 LT 10 cwt (105,200 kg) ♥ 102 LT 15 cwt (104,400 kg) |
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Loco weight | ♠ 148 LT 8 cwt (150,800 kg) ♥ 147 LT 18 cwt (150,300 kg) |
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Fuel type | Coal |
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Fuel capacity | 9 LT (9.1 t) |
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Water cap. | 3,300 imp gal (15,000 L) front 1,300 imp gal (5,910 L) rear |
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Firebox: | |
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• Type | Belpaire |
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• Grate area | 52 sq ft (4.8 m2) |
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Boiler:
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• Pitch | 7 ft 9+1⁄4 in (2,369 mm) |
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• Diameter | 6 ft 9 in (2,057 mm) |
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• Tube plates | 11 ft 3 in (3,429 mm) |
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• Small tubes | 288: 2 in (51 mm) |
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• Large tubes | 36: 5+1⁄2 in (140 mm) |
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Boiler pressure | 180 psi (1,241 kPa) |
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Safety valve | Ramsbottom |
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Heating surface: | |
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• Firebox | ♣ 215 sq ft (20.0 m2) ♦♥ 202 sq ft (18.8 m2) |
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• Tubes | 2,374 sq ft (220.552 m2) |
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• Arch tubes | ♥ 27 sq ft (2.5 m2) |
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• Total surface | ♣ 2,589 sq ft (240.5 m2) ♦ 2,576 sq ft (239.3 m2) ♥ 2,603 sq ft (241.8 m2) |
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Superheater:
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• Heating area | ♣ 362 sq ft (33.6 m2) ♦ 349 sq ft (32.4 m2) ♥ 364 sq ft (33.8 m2) |
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Cylinders | Four |
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Cylinder size | ♠ 18 in (457 mm) bore ♥ 19 in (483 mm) bore ♠♥ 24 in (610 mm) stroke |
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Valve gear | Walschaerts |
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Valve type | Piston |
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Couplers | Johnston link-and-pin AAR knuckle (1930s) |
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