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: • Firegrate 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 |
---|
|
|
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Withdrawn |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 |