Compare locomotives
Add a locomotive
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 | 1931 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | (2D)(D2) t ga |
| Gauge | 1676 mm |
| Length | |
| Service mass | 207426 kg |
| Top speed | 72 km/h |
| Power | |
| Engine |
General
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Built | 1931 |
| 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 | 24.82 m |
| Service mass | 207.4 t |
| Adhesion mass | 140.8 t |
| Rigid wheelbase | 4.75 m |
| Axle load | 17.9 t |
| Water capacity | 22,694 l |
| Fuel capacity | 8.1 t (coal) |
Boiler
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Grate area | 6.28 m² |
| Firebox surface | 30.658 m² |
| Tube heating surface | 244.428 m² |
| Evaporative heating surface | 275.086 m² |
| Superheater surface | 59.644 m² |
| Total heating surface | 334.7 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, 508 x 660 mm |
Power
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,659 kW (2,256 PS) |
| Top speed | 72 km/h |
| Starting effort | 294.9 kN |
Calculated values
| Property | Bengal Nagpur classes N and NMRemove |
|---|---|
| Factor of adhesion | 1 : 4.68 |
| Optimal speed | 34 km/h |
| Power-to-weight ratio | 8.0 kW/t |
| Heating Surface Equivalent | 547.7 m² |
| Cylinder volume/HSE | 1 : 977.62 |
| Adhesive weight/Total | 1 : 1.47 |
| Tractive force/Heating surface | 1 : 18.40 |
| Grate area/Heating surface | 1 : 53.30 |
| Firebox/Tube surface | 1 : 7.97 |
| Total/Superheater | 1 : 4.61 |
