BNR class NM

The Bengal Nagpur Railway class NM was a class of ten 4-8-0+0-8-4 Garratt locomotives manufactured by Beyer, Peacock & Company in England. This was modified N class Garratt with a 17-ton axle load.^[1] It had thermic siphons and arch tubes for better performance. It worked on the Bilaspur-Katni line and Anuppur-Chirmiri branch line for hauling coal. They were withdrawn by the late 1960s, possibly due to their poppet valves.^[2]

Power typeSteam

Power typeSteam

BuilderBeyer, Peacock & Company

Serial number6705–6714

Quick facts Class NM, Type and origin ...

Class NM
BNR 829 with a Katni-bound goods train in the Sahdol district, December 1944
Type and origin Power type Steam Builder Beyer, Peacock & Company Serial number 6705–6714 Build date 1931 Total produced 10
Specifications Configuration: ​  • Whyte 4-8-0+0-8-4 Gauge 5 ft 6 in (1,676 mm) Driver dia. 4 ft 8 in (1.422 m) Axle load 17.5 long tons (17.8 t) Adhesive weight 138.55 long tons (140.77 t) Loco weight 204.15 long tons (207.43 t) Fuel type Coal Fuel capacity 8 long tons (8.1 t) Water cap. 6,000 imp gal (27,000 L; 7,200 US gal) Firebox: ​  • Grate area 67.6 sq ft (6.28 m2) Boiler pressure 210 psi (1.45 MPa) Heating surface 2,961 sq ft (275.1 m2) Superheater: ​  • Heating area 642 sq ft (59.6 m2) Cylinders Four, outside Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Lentz or Caprotti Valve type Poppet
Performance figures Tractive effort 69,660 lbf (309.86 kN)
Career Operators Bengal Nagpur Railway →Indian Railways Numbers BNR: 826–835 →IR: 38826–38835 Locale East Central Railway zone First run 1931 Withdrawn Late 1960s Disposition Scrapped

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