| BNR class N |
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| Specifications |
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Configuration:
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| • Whyte | 4-8-0+0-8-4 |
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| • UIC | (2′D)(D2′) h4t |
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| Gauge | 5 ft 6 in (1,676 mm) |
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| Driver dia. | 4 ft 8 in (1.422 m) |
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| Axle load | 20.25 long tons (20.57 t; 22.68 short tons) |
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| Adhesive weight | 159.4 long tons (162.0 t; 178.5 short tons) |
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| Loco weight | 234 long tons (237.8 t; 262.1 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 14 long tons (14.2 t; 15.7 short tons) |
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| Water cap. | 10,000 imp gal (45,000 L; 12,000 US gal) |
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| Firebox: | |
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| • Grate area | 69.8 sq ft (6.48 m2) |
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| Boiler pressure | 210 psi (1.45 MPa) |
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Superheater:
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| • Heating area | 642 sq ft (59.6 m2) |
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| Cylinders | Four, outside |
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| Cylinder size | 20+1⁄2 in × 26 in (521 mm × 660 mm) |
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| Valve gear | Walschaerts |
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| Valve type | Piston valves |
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| Performance figures |
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| Maximum speed | 45 mph (72 km/h) |
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| Tractive effort | 69,655 lbf (309.84 kN) |
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The Bengal Nagpur Railway class N was a class of 4-8-0+0-8-4 Garratt steam locomotives built by Beyer, Peacock & Company in England in 1929. At the time of their construction, they had the largest water capacity of any Garratt, in addition to being the largest locomotives in India. The class N Garratts were introduced following successful performance results from the earlier HSG Garratts. Due to their heavy weight, they were restricted to 90 lb/yd (45 kg/m) rails. They had straight-ported cylinders; it is not known if this was suitable for slow, heavy coal traffic. Like the earlier HSG Garratts, they worked on the Chakradharpur-Jharsuguda and the Anara-Tatanagar sections. After electrification, they were used at Rourkela. They could haul 2,400 t (2,362 long tons; 2,646 short tons) on a 1 in 100 gradient.
In 2006, class member 811 at Kharagpur workshop was returned to working order and used on a few runs before being stored again. Many parts were borrowed from class member 815 at the National Rail Museum of India in order to achieve this. The parts were later returned and refitted to 815, which was given a cosmetic overhaul. In 2018 a second attempt to return 811 to working order was made; this time all missing parts were fabricated in a US$400,000 refurbishment that was put out to public tender. The locomotive had one test run in late 2019, and has remained on static display as of 2024.
