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Duluth, Missabe & Northern classes M, M-1 and M-2
In 1910, the DM&N received initially eight heavy Mallets of the 2-8-8-2 wheel arrangement, which they designated as class M and which largely corresponded to the class AB No. 600 of the Virginian. The intended area of...
| Duluth, Missabe & Northern classes M, M-1 and M-2Remove | |
|---|---|
| Variant | M superheated |
| Built | 1925 |
| Manufacturers | DM&N |
| Wheel arrangement | (1D)D1 ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 197767 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Duluth, Missabe & Northern classes M, M-1 and M-2M superheated |
|---|---|
| Built | 1925 |
| Manufacturers | DM&N |
| Wheel arrangement | 2-8-8-2 (Mikado Mallet) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Duluth, Missabe & Northern classes M, M-1 and M-2M superheated |
|---|---|
| Wheelbase | 17.73 m |
| Total wheelbase | 26.52 m |
| Service mass | 197.8 t |
| Adhesion mass | 177.9 t |
| Total mass | 275.7 t |
| Rigid wheelbase | 4.57 m |
| Axle load | 22.2 t |
| Water capacity | 34,069 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Duluth, Missabe & Northern classes M, M-1 and M-2M superheated |
|---|---|
| Grate area | 7.804 m² |
| Firebox surface | 31.587 m² |
| Tube heating surface | 351.36 m² |
| Evaporative heating surface | 382.947 m² |
| Superheater surface | 86.493 m² |
| Total heating surface | 469.4 m² |
Power plant
| Property | Duluth, Missabe & Northern classes M, M-1 and M-2M superheated |
|---|---|
| Driver diameter | 1,448 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | compound |
| Cylinders | four, HP: 660 x 813 mm and LP: 1,016 x 813 mm |
Power
| Property | Duluth, Missabe & Northern classes M, M-1 and M-2M superheated |
|---|---|
| Power source | steam |
| Estimated power | 2,163 kW (2,941 PS) |
| Starting effort | 403.5 kN |
| Starting effort simple | 484.2 kN |
Calculated values
| Property | Duluth, Missabe & Northern classes M, M-1 and M-2M superheated |
|---|---|
| Factor of adhesion | 1 : 4.33 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 10.9 kW/t |
| Heating Surface Equivalent | 713.9 m² |
| Cylinder volume/HSE | 1 : 1,703.10 |
| Adhesive weight/Total | 1 : 1.11 |
| Tractive force/Heating surface | 1 : 17.95 |
| Grate area/Heating surface | 1 : 60.15 |
| Firebox/Tube surface | 1 : 11.12 |
| Total/Superheater | 1 : 4.43 |
