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Soviet Railways series AA 20
In order to create a locomotive with the largest possible boiler without using an articulated running gear with flexible steam lines, the Soviet Railways designed a locomotive with seven coupled axles in a single fram...
General
| Property | Soviet Railways series AA 20Remove |
|---|---|
| Built | 1934 |
| Manufacturers | Luhansk |
| Wheel arrangement | 4-14-4 |
| Gauge | 1,520 mm (Russian broad gauge) |
Dimensions and weights
| Property | Soviet Railways series AA 20Remove |
|---|---|
| Length | 33.73 m |
| Length loco | 20.72 m |
| Wheelbase | 17.32 m |
| Rigid wheelbase | 6.70 m |
| Empty weight | 179.8 t |
| Service weight | 206 t |
| Adhesive weight | 138.8 t |
| Axle load | 19.8 t |
| Total weight | 330 t |
| Water capacity | 52,300 l |
| Fuel capacity | 24.2 t (coal) |
Boiler
| Property | Soviet Railways series AA 20Remove |
|---|---|
| Grate area | 12 m² |
| Firebox surface | 55.3 m² |
| Tube heating surface | 395 m² |
| Evaporative heating surface | 450.3 m² |
| Superheater surface | 176 m² |
| Total heating surface | 626.3 m² |
Power plant
| Property | Soviet Railways series AA 20Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 17 bar |
| Expansion type | simple expansion |
| Cylinders | two, 740 x 810 mm |
Power
| Property | Soviet Railways series AA 20Remove |
|---|---|
| Power source | steam |
| Indicated power | 2,723 kW (3,702 PS) |
| Starting effort | 400.6 kN |
Calculated values
| Property | Soviet Railways series AA 20Remove |
|---|---|
| Factor of adhesion | 1 : 3.40 |
| Optimal speed | 42 km/h |
| Power-to-weight ratio | 13.2 kW/t |
| Heating Surface Equivalent | 1,078.8 m² |
| Cylinder volume/HSE | 1 : 645.84 |
| Adhesive weight/Total | 1 : 1.48 |
| Tractive force/Heating surface | 1 : 13.36 |
| Grate area/Heating surface | 1 : 52.19 |
| Firebox/Tube surface | 1 : 7.14 |
| Total/Superheater | 1 : 2.56 |
