| BNR Class P |
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| Specifications |
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Configuration:
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| • Whyte | 4-8-2+2-8-4 Garratt |
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| • UIC | (2′D1′)(2′D1′) 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 | 17 long tons (17 t) |
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| Loco weight | 230 long tons (230 t) |
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| Fuel type | Coal |
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| Fuel capacity | 10 long tons (10 t) |
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| Water cap. | 7,500 imp gal (34,000 L; 9,000 US gal) |
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| Firebox: | |
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| • Grate area | 70 sq ft (6.5 m2) |
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| Boiler pressure | 210 psi (1.45 MPa) |
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Superheater:
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| • Heating area | 661 sq ft (61.4 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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The Bengal Nagpur Railway class P was a class of four 4-8-2+2-8-4 (“Double Mountain”) Garratt locomotives. It was developed from BNR class N and BNR class NM. The Anuppur-Chirmiri section had severe curves and it needed an engine with a trailing bogie. Its boiler was slightly enlarged similar to the NM.
It could haul 1,500 long tons (1,500 t) load up a 1 in 91 gradient.[1]
Technical specifications
| Boiler diameter | 7 ft 1+13⁄16 in (2.180 m) |
| Heating area in firebox | 330 sq ft (31 m2) |
| Boiler area | 3,120 sq ft (290 m2) |
| Adhesive weight | 136 tonnes |
| Maximum train load | 3165 tonnes on level track |
References
