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Duluth, Missabe & Iron Range classes M-3 and M-4
For heavy ore trains with up to 115 cars, the Duluth, Missabe & Iron Range needed more powerful locomotives, where the most difficult task was to pull the empty trains up the 2.2 percent steep ramp from the port in Du...
| Duluth, Missabe & Iron Range classes M-3 and M-4Remove | |
|---|---|
| Variant | Standard |
| Built | 1941, 1943 |
| Manufacturers | Baldwin |
| Wheel arrangement | (1D)D2 ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 315265 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Duluth, Missabe & Iron Range classes M-3 and M-4 Standard Remove |
|---|---|
| Built | 1941, 1943 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2-8-8-4 (Yellowstone) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Duluth, Missabe & Iron Range classes M-3 and M-4 Standard Remove |
|---|---|
| Wheelbase | 20.47 m |
| Total wheelbase | 34.60 m |
| Service mass | 315.3 t |
| Adhesion mass | 254.1 t |
| Total mass | 513.9 t |
| Rigid wheelbase | 5.26 m |
| Axle load | 31.8 t |
| Water capacity | 94,635 l |
| Fuel capacity | 24.5 t (coal) |
Boiler
| Property | Duluth, Missabe & Iron Range classes M-3 and M-4 Standard Remove |
|---|---|
| Grate area | 11.613 m² |
| Firebox surface | 69.677 m² |
| Tube heating surface | 560.392 m² |
| Evaporative heating surface | 630.069 m² |
| Superheater surface | 257.342 m² |
| Total heating surface | 887.4 m² |
Power plant
| Property | Duluth, Missabe & Iron Range classes M-3 and M-4 Standard Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 16.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 660 x 813 mm |
Power
| Property | Duluth, Missabe & Iron Range classes M-3 and M-4 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 4,474 kW (6,083 PS) |
| Starting effort | 623.2 kN |
Calculated values
| Property | Duluth, Missabe & Iron Range classes M-3 and M-4 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.00 |
| Optimal speed | 43 km/h |
| Power-to-weight ratio | 14.2 kW/t |
| Heating Surface Equivalent | 1,493.1 m² |
| Cylinder volume/HSE | 1 : 745.84 |
| Adhesive weight/Total | 1 : 1.24 |
| Tractive force/Heating surface | 1 : 14.67 |
| Grate area/Heating surface | 1 : 76.42 |
| Firebox/Tube surface | 1 : 8.04 |
| Total/Superheater | 1 : 2.45 |
