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Union Pacific classes MT-1 and MT-2
The only 4-8-2 Mountain locomotives ever operated by the Union Pacific were the classes MT-1 and MT-2, which were nearly identical apart from their firing method. The first 40 MT-1 were built in 1922 by ALCO, followed...
| Union Pacific classes MT-1 and MT-2Remove | |
|---|---|
| Variant | |
| Built | 1922-1923 |
| Manufacturers | ALCO |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 157850 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Union Pacific classes MT-1 and MT-2Remove |
|---|---|
| Built | 1922-1923 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Union Pacific classes MT-1 and MT-2Remove |
|---|---|
| Wheelbase | 12.57 m |
| Total wheelbase | 24.37 m |
| Service mass | 157.9 t |
| Adhesion mass | 105.2 t |
| Total mass | 265.6 t |
| Rigid wheelbase | 5.97 m |
| Axle load | 26.3 t |
| Water capacity | 45,425 l |
| Fuel capacity | 18.1 t (coal) |
Boiler
| Property | Union Pacific classes MT-1 and MT-2Remove |
|---|---|
| Grate area | 7.804 m² |
| Firebox surface | 35.489 m² |
| Tube heating surface | 426.611 m² |
| Evaporative heating surface | 462.1 m² |
| Superheater surface | 115.386 m² |
| Total heating surface | 577.5 m² |
Power plant
| Property | Union Pacific classes MT-1 and MT-2Remove |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 737 x 711 mm |
Power
| Property | Union Pacific classes MT-1 and MT-2Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,498 kW (3,396 PS) |
| Starting effort | 243.9 kN |
Calculated values
| Property | Union Pacific classes MT-1 and MT-2Remove |
|---|---|
| Factor of adhesion | 1 : 4.23 |
| Optimal speed | 63 km/h |
| Power-to-weight ratio | 15.8 kW/t |
| Heating Surface Equivalent | 870.3 m² |
| Cylinder volume/HSE | 1 : 696.46 |
| Adhesive weight/Total | 1 : 1.50 |
| Tractive force/Heating surface | 1 : 8.82 |
| Grate area/Heating surface | 1 : 74.00 |
| Firebox/Tube surface | 1 : 12.02 |
| Total/Superheater | 1 : 4.00 |
