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Bengal Nagpur classes N and NM
After the Bengal-Nagpur had tested two class HSG 2-8-0+0-8-2 Garratts for slow and heavy coal trains on inclines, they ordered the 4-8-0+0-8-4 class N in 1929. With a service weight of 234 tons, they are the heaviest ...
| Bengal Nagpur classes N and NMRemove | |
|---|---|
| Variant | |
| Built | 1929 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | (2D)(D2) t ga |
| Gauge | 1676 mm |
| Length | |
| Service mass | 237755 kg |
| Top speed | 72 km/h |
| Power | |
| Engine |
General
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Built | 1929 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | 4-8-0+0-8-4T (Double Mastodon (Garratt)) |
| Gauge | 1,676 mm |
Dimensions and weights
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Wheelbase | 8.38 m |
| Total wheelbase | 25.63 m |
| Service mass | 237.8 t |
| Adhesion mass | 162 t |
| Rigid wheelbase | 4.75 m |
| Axle load | 20.6 t |
| Water capacity | 45,459 l |
| Fuel capacity | 14.2 t (coal) |
Boiler
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Grate area | 6.48 m² |
| Firebox surface | 26.57 m² |
| Tube heating surface | 289.672 m² |
| Evaporative heating surface | 316.242 m² |
| Superheater surface | 59.644 m² |
| Total heating surface | 375.9 m² |
Power plant
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Driver diameter | 1,422 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 521 x 660 mm |
Power
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,715 kW (2,332 PS) |
| Top speed | 72 km/h |
| Starting effort | 309.8 kN |
Calculated values
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Factor of adhesion | 1 : 5.13 |
| Optimal speed | 34 km/h |
| Power-to-weight ratio | 7.2 kW/t |
| Heating Surface Equivalent | 568.4 m² |
| Cylinder volume/HSE | 1 : 989.68 |
| Adhesive weight/Total | 1 : 1.47 |
| Tractive force/Heating surface | 1 : 17.22 |
| Grate area/Heating surface | 1 : 58.01 |
| Firebox/Tube surface | 1 : 10.90 |
| Total/Superheater | 1 : 5.30 |
