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Class NM 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: 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
Career Operators Numbers BNR: 826–835 →IR: 38826–38835 Locale East Central Railway zone First run 1931 Last run 1960 Withdrawn 1960 Preserved 0 Scrapped 1960 Disposition Scrapped
The Bengal Nagpur Railway class NM was a class of ten 4-8-0+0-8-4 Garratt locomotives . This was modified N class Garratt . It had Thermic siphon and arch tubes for better performance. It worked on the Bilaspur -Katni line and Anuppur -Chirmiri branch line for hauling coal. Probably because of Poppet valves, they retired early.[ 1]
Technical specifications
Boiler diameter
7 ft 1+ 13 ⁄16 in (2.18 m)
Heating surface of firebox
330 sq ft (31 m2 )
Maximum train load
3,000 long tons (3,000 t) on level track
See also References
