Wabash class K-3
United States 1923 30 produced
The Wabash class K-3 consisted of 30 locomotives which were based on the USRA Light Mikado that was designated K-2 at the Wabash, but had a firebox and tube heating surface that was nearly as big as that of the Heavy Mikado. The boiler pressure had been increased to 210 psi, but the grate and cylinders still had the same sizes.
Schenectady built 30 in 1923, of which the last five had a booster. The first 25 were only designated K-3 and numbered 2250 to 2274, while the last five with booster were designated K-3b and numbered 2275 to 2279. Later these locomotives got Worthington feed water heaters and Duplex stokers. No. 2254 had to be scrapped in 1944, but the others were only scrapped between 1950 and 1955.
Technical data
General
| Property | K-3 | K-3b |
|---|---|---|
| Built | 1923 | |
| Manufacturers | ALCO | |
| Wheel arrangement | 2-8-2 (Mikado) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | K-3 | K-3b |
|---|---|---|
| Wheelbase | 11.33 m | |
| Total wheelbase | 21.91 m | |
| Service mass | 147.4 t | 150.1 t |
| Adhesion mass | 109.8 t | |
| Total mass | 236.4 t | 239.1 t |
| Rigid wheelbase | 5.11 m | |
| Axle load | 27.9 t | |
| Water capacity | 37,854 l | |
| Fuel capacity | 20 t (coal) | |
Boiler
| Property | K-3 | K-3b |
|---|---|---|
| Grate area | 6.197 m² | |
| Firebox surface | 28.335 m² | |
| Tube heating surface | 360.836 m² | |
| Evaporative heating surface | 389.171 m² | |
| Superheater surface | 97.641 m² | |
| Total heating surface | 486.8 m² | |
Power plant
| Property | K-3 | K-3b |
|---|---|---|
| Driver diameter | 1,626 mm | |
| Boiler pressure | 14.5 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 686 x 813 mm | |
Power
| Property | K-3 | K-3b |
|---|---|---|
| Power source | steam | |
| Estimated power | 2,386 kW (3,244 PS) | |
| Starting effort | 289.4 kN | |
| Starting effort booster | 52.649 kN | |
Calculated values
| Property | K-3 | K-3b |
|---|---|---|
| Factor of adhesion | 1 : 3.72 | |
| Optimal speed | 50 km/h | |
| Power-to-weight ratio | 16.2 kW/t | 15.9 kW/t |
| Heating Surface Equivalent | 726.1 m² | |
| Cylinder volume/HSE | 1 : 826.96 | |
| Adhesive weight/Total | 1 : 1.34 | 1 : 1.37 |
| Tractive force/Heating surface | 1 : 12.42 | |
| Grate area/Heating surface | 1 : 78.56 | |
| Firebox/Tube surface | 1 : 12.73 | |
| Total/Superheater | 1 : 3.99 | |
