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Seaboard Air Line class Q-3
After the Seaboard Air Line had already put ten USRA Light Mikados into service as class Q-1, a total of 117 copies were built as the Q-3 from 1923 onwards. They differed from the USRA locomotives primarily in the fir...
General
| Property | Seaboard Air Line class Q-3Remove |
|---|---|
| Built | 1923-1926, 1931 |
| Manufacturers | ALCO, Baldwin, SAL |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Seaboard Air Line class Q-3Remove |
|---|---|
| Wheelbase | 11.53 m |
| Rigid wheelbase | 5.11 m |
| Total wheelbase | 22.82 m |
| Service weight | 136.1 t |
| Adhesive weight | 96.2 t |
| Axle load | 24 t |
| Total weight | 222.5 t |
| Water capacity | 36,340 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Seaboard Air Line class Q-3Remove |
|---|---|
| Grate area | 5.871 m² |
| Firebox surface | 27.035 m² |
| Tube heating surface | 324.696 m² |
| Evaporative heating surface | 351.731 m² |
| Superheater surface | 81.941 m² |
| Total heating surface | 433.7 m² |
Power plant
| Property | Seaboard Air Line class Q-3Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 762 mm |
Power
| Property | Seaboard Air Line class Q-3Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,163 kW (2,941 PS) |
| Starting effort | 243.4 kN |
| Starting effort booster | 46.706 kN |
Calculated values
| Property | Seaboard Air Line class Q-3Remove |
|---|---|
| Factor of adhesion | 1 : 3.88 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 15.9 kW/t |
| Heating Surface Equivalent | 650.8 m² |
| Cylinder volume/HSE | 1 : 802.14 |
| Adhesive weight/Total | 1 : 1.42 |
| Tractive force/Heating surface | 1 : 11.72 |
| Grate area/Heating surface | 1 : 73.87 |
| Firebox/Tube surface | 1 : 12.01 |
| Total/Superheater | 1 : 4.29 |
