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Union Pacific classes 1820 and 1830
In 1900 and 1901, Baldwin built 28 similar four-cylinder Vauclain compound Ten-wheelers for the Union Pacific. The first ten were numbered 1820 to 1829 and had drivers of 69 inches, what led to the designation T-69. T...
| Union Pacific classes 1820 and 1830Remove | |
|---|---|
| Variant | 1820 superheated |
| Built | 1900 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2C |
| Gauge | 1435 mm |
| Length | |
| Service mass | 84232 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Union Pacific classes 1820 and 18301820 superheated |
|---|---|
| Built | 1900 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Union Pacific classes 1820 and 18301820 superheated |
|---|---|
| Wheelbase | 8.15 m |
| Total wheelbase | 19.80 m |
| Service mass | 84.2 t |
| Adhesion mass | 65.5 t |
| Total mass | 139.8 t |
| Rigid wheelbase | 4.42 m |
| Axle load | 23.3 t |
| Water capacity | 22,712 l |
| Fuel capacity | 10.9 t (coal) |
Boiler
| Property | Union Pacific classes 1820 and 18301820 superheated |
|---|---|
| Grate area | 3.008 m² |
| Firebox surface | 17.001 m² |
| Tube heating surface | 183.669 m² |
| Evaporative heating surface | 200.671 m² |
| Superheater surface | 41.806 m² |
| Total heating surface | 242.5 m² |
Power plant
| Property | Union Pacific classes 1820 and 18301820 superheated |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 711 mm |
Power
| Property | Union Pacific classes 1820 and 18301820 superheated |
|---|---|
| Power source | steam |
| Estimated power | 1,007 kW (1,369 PS) |
| Starting effort | 122.7 kN |
Calculated values
| Property | Union Pacific classes 1820 and 18301820 superheated |
|---|---|
| Factor of adhesion | 1 : 5.24 |
| Optimal speed | 50 km/h |
| Power-to-weight ratio | 12.0 kW/t |
| Heating Surface Equivalent | 369.3 m² |
| Cylinder volume/HSE | 1 : 780.68 |
| Adhesive weight/Total | 1 : 1.29 |
| Tractive force/Heating surface | 1 : 10.57 |
| Grate area/Heating surface | 1 : 80.61 |
| Firebox/Tube surface | 1 : 10.80 |
| Total/Superheater | 1 : 4.80 |
