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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 ...
General
| Property | Union Pacific classes MC-2 to MC-6 rebuilt SA-C-2 to SA-C-6 |
|---|---|
| Built | 1937-1943 |
| Manufacturers | Union Pacific |
| Wheel arrangement | 2-8-8-0 (Bull Moose) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Union Pacific classes MC-2 to MC-6 rebuilt SA-C-2 to SA-C-6 |
|---|---|
| Wheelbase | 15.39 m |
| Rigid wheelbase | 4.72 m |
| Total wheelbase | 26.48 m |
| Service weight | 227.5 t |
| Adhesive weight | 213.4 t |
| Axle load | 29.1 t |
| Total weight | 330.6 t |
| Water capacity | 45,425 l |
| Fuel capacity | 19,684 l (oil) |
Boiler
| Property | Union Pacific classes MC-2 to MC-6 rebuilt SA-C-2 to SA-C-6 |
|---|---|
| Grate area | 8.185 m² |
| Firebox surface | 36.511 m² |
| Tube heating surface | 485.79 m² |
| Evaporative heating surface | 522.301 m² |
| Superheater surface | 122.632 m² |
| Total heating surface | 644.9 m² |
Power plant
| Property | Union Pacific classes MC-2 to MC-6 rebuilt SA-C-2 to SA-C-6 |
|---|---|
| Driver diameter | 1,499 mm |
| Boiler pressure | 15.2 bar |
| Expansion type | simple expansion |
| Cylinders | four, 584 x 762 mm |
Power
| Property | Union Pacific classes MC-2 to MC-6 rebuilt SA-C-2 to SA-C-6 |
|---|---|
| Power source | steam |
| Estimated power | 2,796 kW (3,802 PS) |
| Starting effort | 447.5 kN |
Calculated values
| Property | Union Pacific classes MC-2 to MC-6 rebuilt SA-C-2 to SA-C-6 |
|---|---|
| Factor of adhesion | 1 : 4.68 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 12.3 kW/t |
| Heating Surface Equivalent | 950.1 m² |
| Cylinder volume/HSE | 1 : 859.90 |
| Adhesive weight/Total | 1 : 1.07 |
| Tractive force/Heating surface | 1 : 14.49 |
| Grate area/Heating surface | 1 : 78.79 |
| Firebox/Tube surface | 1 : 13.31 |
| Total/Superheater | 1 : 4.26 |
