| Norfolk and Western 2156 |
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N&W 2156 on display at the Virginia Museum of Transportation in Roanoke, Virginia, on December 11, 2016 |
| Type and origin |
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| Power type | Steam |
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| Builder | Roanoke Shops (East End Shops) |
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| Serial number | 317 |
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| Build date | March 19, 1942 |
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| Specifications |
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Configuration:
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| • Whyte | 2-8-8-2 |
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| • UIC | (1′D)D1′ hv4 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Leading dia. | 20 in (508 mm) |
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| Driver dia. | 58 in (1,473 mm) (as built 57 in (1,448 mm)) |
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| Trailing dia. | 20 in (508 mm) |
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| Tender wheels | 33 in (838 mm) |
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| Wheelbase | 103 ft 8+1⁄4 in (31.60 m) |
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| • Engine | 58 ft 0 in (17.68 m) |
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Length:
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| • Over couplers | 114 ft 10+1⁄2 in (35.01 m) |
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| Height | 15 ft 8+7⁄16 in (4.79 m) |
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| Adhesive weight | 522,850 lb (237.2 tonnes) |
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| Loco weight | 582,900 lb (264.4 tonnes) |
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| Tender weight | 143,200 lb (65.0 tonnes)) (empty)
378,600 lb (171.7 tonnes)) (loaded) |
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| Total weight | 961,500 lb (436.1 tonnes)) |
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| Fuel type | Coal |
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| Fuel capacity | 30 t (30 long tons; 33 short tons) |
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| Water cap. | 22,000 US gal (83,000 L; 18,000 imp gal) |
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| Firebox: | |
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| • Grate area | 106.2 sq ft (9.87 m2) |
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Boiler:
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| • Model | 104 in (2,642 mm) |
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| • Small tubes | 2+1⁄4 in (57 mm) |
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| • Large tubes | 5+1⁄2 in (140 mm) |
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| Boiler pressure | 300 psi (2.07 MPa) |
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| Safety valve | 4 Ashton 3+1⁄2 in (89 mm) |
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| Feedwater heater | Worthington BL-2 |
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| Heating surface: | |
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| • Firebox | 371 sq ft (34.5 m2) |
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| • Arch tubes | 59 sq ft (5.5 m2) |
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| • Flues | 5,226 sq ft (485.5 m2) |
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| • Total surface | 7,431 sq ft (690.4 m2) |
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Superheater:
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| • Type | Type A |
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| • Heating area | 1,775 sq ft (164.9 m2) |
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| Cylinders | Four: two low-pressure (front), two high-pressure (rear) |
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| High-pressure cylinder | 25 in × 32 in (635 mm × 813 mm) |
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| Low-pressure cylinder | 39 in × 32 in (991 mm × 813 mm) |
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| Valve gear | Baker |
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| Performance figures |
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| Maximum speed | 50 mph (80 km/h) |
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| Power output | 5,600 hp (4,200 kW) (as built 4,400 hp (3,300 kW)) |
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| Tractive effort | (Simple: 166,000 lbf (738.4 kN)) (Compound: 126,838 lbf (564.2 kN)) (as built 152,206 lbf (677.0 kN)) |
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| Factor of adh. | 3.30 |
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| References: |
Norfolk and Western 2156 is a preserved Y6a class 2-8-8-2 compound Mallet steam locomotive. The Norfolk and Western Railway (N&W) built it in 1942 at its own Shops in Roanoke, Virginia as the second member of the N&W's Y6a class. No. 2156 and its class are considered to be the world's strongest-pulling extant steam locomotive to ever be built.
No. 2156 was retired from revenue service in July 1959, and it is now owned by the National Museum of Transportation in St. Louis, Missouri. In 2014, the museum leased it for five years to the Virginia Museum of Transportation in Roanoke. It was towed to Roanoke in May 2015, and then it was towed back to St. Louis in June 2020.
