Sierra Railway No. 20 and 22
In 1916, Baldwin delivered the first superheated Consolidation to the Sierra Railway that got the number 20. Its works number had been 43344. Compared to the earlier No. 18 delivered in 1906, it had the same main dimensions and was also oil-fired. The grate area was the same as on 18, but the firebox heating area was larger. The tender now carried 4,000 gallons of water and 1,000 gallons of oil, compared to 3,000 and 800 gallons on the predecessor.
A second superheated Consolidation that followed in 1920 was No. 22 with works number 53205. In most respects it was identical to 20, but the tubes and flues were half a foot shorter, leading to smaller tube heating and superheater areas. However, this locomotive was 5,000 pounds heavier.
In 1942, 20 was drafted by the US Army until it was sold to Kurth Brothers Lumber of Jasper, Texas in 1948. There it was scrapped in 1955. The 22 had already been sold to the California Railway & Navigation Company in 1940. There it was numbered 41 and was scrapped in 1950.
Technical data
General
| Property | 20 | 22 |
|---|---|---|
| Built | 1916 | 1920 |
| Manufacturers | Baldwin | |
| Wheel arrangement | 2-8-0 (Consolidation) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | 20 | 22 |
|---|---|---|
| Wheelbase | 5.99 m | |
| Service mass | 52.6 t | 54.9 t |
| Adhesion mass | 46.7 t | 48.5 t |
| Total mass | 88.9 t | 93.2 t |
| Rigid wheelbase | 3.71 m | |
| Axle load | 11.7 t | 12.1 t |
| Water capacity | 15,142 l | |
| Fuel capacity | 3,785 l (oil) | |
Boiler
| Property | 20 | 22 |
|---|---|---|
| Grate area | 2.062 m² | |
| Firebox surface | 12.542 m² | |
| Tube heating surface | 91.231 m² | 87.329 m² |
| Evaporative heating surface | 103.773 m² | 99.871 m² |
| Superheater surface | 23.226 m² | 21.461 m² |
| Total heating surface | 127.0 m² | 121.3 m² |
Power plant
| Property | 20 | 22 |
|---|---|---|
| Driver diameter | 1,067 mm | |
| Boiler pressure | 12.4 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 457 x 559 mm | |
Power
| Property | 20 | 22 |
|---|---|---|
| Power source | steam | |
| Estimated power | 708 kW | |
| Starting effort | 115.5 kN | |
Calculated values
| Property | 20 | 22 |
|---|---|---|
| Factor of adhesion | 1 : 3.97 | 1 : 4.12 |
| Optimal speed | 37 km/h | |
| Power-to-weight ratio | 13.5 kW/t | 12.9 kW/t |
| Heating Surface Equivalent | 212.9 m² | 205.5 m² |
| Cylinder volume/HSE | 1 : 861.67 | 1 : 892.83 |
| Adhesive weight/Total | 1 : 1.13 | |
| Tractive force/Heating surface | 1 : 18.99 | 1 : 19.88 |
| Grate area/Heating surface | 1 : 61.59 | 1 : 58.84 |
| Firebox/Tube surface | 1 : 7.27 | 1 : 6.96 |
| Total/Superheater | 1 : 4.47 | 1 : 4.65 |
