| BNB Class VIb kkStB Class 265 ČSD Class 312.7 |
|
|---|---|
| Number(s): | BNB VIb 126/127 kkStB 265.01 / 02 ČSD 312.701 / 702 |
| Quantity: | 2 |
| Manufacturer: | Erste Böhmisch-Mährische Maschinenfabrik, Prague |
| Year(s) of manufacture: | 1907 |
| Retired: | 1949 |
| Wheel arrangement: | 0-6-2T |
| Axle arrangement: | C1'n2t |
| Gauge: | 1,435 mm |
| Length over buffers: | 9,836 mm |
| Overall wheelbase: | 4,800 mm |
| Empty weight: | 32.3 t |
| Service weight: | 44.6 t |
| Adhesive weight: | 35.2 t |
| Top speed: | 45 km/h |
| Indicated Power: | 259 kW |
| Driving wheel diameter: | 930 mm |
| Carrying wheel diameter: | 840 mm |
| No. of cylinders: | 2 |
| Cylinder bore: | 420 mm |
| Piston stroke: | 480 mm |
| Boiler Overpressure: | 12 bar |
| No. of heating tubes: | 192 |
| Grate area: | 1.66 m² |
| Radiative heating area: | 6.1 m² |
| Tube heating area: | 79.6 m² |
| Evaporative heating area: | 85.7 m² |
| Water capacity: | 7,0 m³ |
| Fuel: | 4.7 m³ coal |
| Brakes: | vacuum brake |
The Austrian kkStB Class 265 were branch line tank locomotives with the Imperial Austrian State Railways, which had originally been procured by the Bohemian Northern Railway Company (Böhmische Nordbahn-Gesellschaft) as Class BNB Class VIb for duties on the Böhmisch Leipa-Steinschönau railway line.
The two locomotives were built in Prague in 1907 by the Erste Böhmisch-Mährische Maschinenfabrik.
The locomotives spent their entire lives on their home line. In 1924 the Czechoslovakian State Railways (ČSD) grouped the engines into their ČSD Class 312.7. After the Second World War the Deutsche Reichsbahn gave them the designation DR Class 90.3.
On the introduction into service of new ČSD Class M 131.1 railcars, these locomotives were retired in 1949.