BNR class NM

Class NM
Type and origin
Power type Steam
Builder Beyer, Peacock and Company
Serial number 6705–6714
Build date 1931
Total produced 10
Specifications
Configuration 4-8-0+0-8-4
Gauge 5 ft 6 in (1,676 mm)
Driver diameter 4 ft 8 in (1.422 m)
Axle load 17.5 long tons (17.8 t)
Weight on drivers 138.55 long tons (140.77 t)
Locomotive weight 204.15 long tons (207.43 t)
Fuel type Coal
Fuel capacity 8 long tons (8.1 t)
Water capacity 6,000 imp gal (27,000 l; 7,200 US gal)
Boiler pressure 210 psi (1.45 MPa)
Firegrate area 67.6 sq ft (6.28 m2)
Heating surface:
– Total		 2,961 sq ft (275.1 m2)
Superheater 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
Operator(s)
Number(s)
  • 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Withdrawn 1960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 locootives. 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

  1. ↑ "5brinkster".