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Union Pacific classes MC-2 to MC-6
The 2-8-8-0 Mallet locomotives of the Union Pacific and its subsidiaries were known as classes MC-2 to MC-6. All batches were characterized by 57 inch drivers and cylinders with diameters of 26 and 41 inches and were ...
| Union Pacific classes MC-2 to MC-6Remove | |
|---|---|
| Variant | |
| Built | 1924 |
| Manufacturers | ALCO |
| Wheel arrangement | (1D)D ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 224755 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Union Pacific classes MC-2 to MC-6Remove |
|---|---|
| Built | 1924 |
| Manufacturers | ALCO |
| Wheel arrangement | 2-8-8-0 (Bull Moose) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Union Pacific classes MC-2 to MC-6Remove |
|---|---|
| Wheelbase | 15.39 m |
| Total wheelbase | 26.53 m |
| Service mass | 224.8 t |
| Adhesion mass | 210.9 t |
| Total mass | 324.1 t |
| Rigid wheelbase | 4.72 m |
| Axle load | 26.9 t |
| Water capacity | 45,425 l |
| Fuel capacity | 18.1 t (coal) |
Boiler
| Property | Union Pacific classes MC-2 to MC-6Remove |
|---|---|
| Grate area | 8.185 m² |
| Firebox surface | 37.44 m² |
| Tube heating surface | 465.352 m² |
| Evaporative heating surface | 502.792 m² |
| Superheater surface | 129.786 m² |
| Total heating surface | 632.6 m² |
Power plant
| Property | Union Pacific classes MC-2 to MC-6Remove |
|---|---|
| Driver diameter | 1,448 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | compound |
| Cylinders | four, HP: 660 x 813 mm and LP: 1,041 x 813 mm |
Power
| Property | Union Pacific classes MC-2 to MC-6Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,722 kW (3,701 PS) |
| Starting effort | 429.8 kN |
| Starting effort simple | 515.8 kN |
Calculated values
| Property | Union Pacific classes MC-2 to MC-6Remove |
|---|---|
| Factor of adhesion | 1 : 4.81 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 12.1 kW/t |
| Heating Surface Equivalent | 949.6 m² |
| Cylinder volume/HSE | 1 : 1,315.49 |
| Adhesive weight/Total | 1 : 1.07 |
| Tractive force/Heating surface | 1 : 14.19 |
| Grate area/Heating surface | 1 : 77.29 |
| Firebox/Tube surface | 1 : 12.43 |
| Total/Superheater | 1 : 3.87 |
