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Bulgarian State Railway class 11
The class 11 of the Bulgarian State Railways was a 4-10-0 locomotive for heavy mixed traffic. As a part of the Bulgarian standard program, they were heavily influenced by the German standard locomotives of the Reichsb...
| Bulgarian State Railway class 11Remove | |
|---|---|
| Variant | Standard |
| Built | 1941-1943 |
| Manufacturers | Henschel;Borsig |
| Wheel arrangement | 2E |
| Gauge | 1435 mm |
| Length | 23105 mm |
| Service mass | 108200 kg |
| Top speed | 75 km/h |
| Power | |
| Engine |
General
| Property | Bulgarian State Railway class 11 Standard Remove |
|---|---|
| Built | 1941-1943 |
| Manufacturers | Henschel, Borsig |
| Wheel arrangement | 4-10-0 (Mastodon) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Bulgarian State Railway class 11 Standard Remove |
|---|---|
| Length | 23.11 m |
| Wheelbase | 10.90 m |
| Total wheelbase | 19.61 m |
| Empty mass | 100.7 t |
| Service mass | 108.2 t |
| Adhesion mass | 85 t |
| Total mass | 179.2 t |
| Rigid wheelbase | 5.30 m |
| Axle load | 17 t |
| Water capacity | 28,000 l |
| Fuel capacity | 13 t (coal) |
Boiler
| Property | Bulgarian State Railway class 11 Standard Remove |
|---|---|
| Grate area | 4.87 m² |
| Firebox surface | 17.5 m² |
| Tube heating surface | 206.6 m² |
| Evaporative heating surface | 224.1 m² |
| Superheater surface | 81.9 m² |
| Total heating surface | 306.0 m² |
Power plant
| Property | Bulgarian State Railway class 11 Standard Remove |
|---|---|
| Driver diameter | 1,450 mm |
| Boiler pressure | 16 bar |
| Expansion type | simple expansion |
| Cylinders | three, 520 x 700 mm |
Power
| Property | Bulgarian State Railway class 11 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,600 kW (2,175 PS) |
| Top speed | 75 km/h |
| Starting effort | 266.3 kN |
Calculated values
| Property | Bulgarian State Railway class 11 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.13 |
| Optimal speed | 37 km/h |
| Power-to-weight ratio | 14.8 kW/t |
| Heating Surface Equivalent | 475.4 m² |
| Cylinder volume/HSE | 1 : 938.12 |
| Adhesive weight/Total | 1 : 1.27 |
| Tractive force/Heating surface | 1 : 18.18 |
| Grate area/Heating surface | 1 : 62.83 |
| Firebox/Tube surface | 1 : 11.81 |
| Total/Superheater | 1 : 2.74 |
