Oldenburgh 2-4-2 Locomotives in Germany
Class Details by Steve Llanso of Sweat House Media
Class T5 /BR 74.4 (Locobase 15295)
Data from Albert Gieseler's Lokomotiven und Dampfmaschinen website entry at [
], last accessed 12 July 2013. See also Sammlung Westerhoff's [] info entry at [] . This small subclass of T5 locomotives had taller drivers than the other T5 variants that came on Prussian railways during this time. They were bought to allow faster operation of the commuter trains then pulled by locomotives restricted to no more than 50 kmh (31 mph). This new class was credited with a 75 kmh (46.6 mph) maximum speed.
The five 1907 locomotives were slightly lighter at an even 30,000 kg (66,139 lb) adhesion weight and 53,600 kg (118,168 lb) engine weight. They also had a slightly shorter engine wheelbase of 6.8 metres (22 ft 3 5/8 in). Westerhoff notes that they were delivered with the Adams axle, which did not track well and which limited the improvement they offered over older engines.
Although all 20 were taken into the DRG in 1925, they had all been withdrawn by the end of 1930.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | T5 /BR 74.4 |
| Locobase ID | 15295 |
| Railroad | Oldenburgh |
| Country | Prussia |
| Whyte | 2-4-2T |
| Number in Class | 20 |
| Road Numbers | BR 71 401-420 |
| Gauge | Std |
| Number Built | 20 |
| Builder | Hanomag |
| Year | 1907 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.73 / 2.05 |
| Engine Wheelbase (ft / m) | 22.97 / 7 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.29 |
| Overall Wheelbase (engine & tender) (ft / m) | 22.97 / 7 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 33,731 / 15,300 |
| Weight on Drivers (lbs / kg) | 67,461 / 30,600 |
| Engine Weight (lbs / kg) | 120,813 / 54,800 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1452 / 5.50 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.80 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 56 / 28 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 174 / 1200 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16.93" x 23.62" / 430x600 |
| Tractive Effort (lbs / kg) | 15,894 / 7209.41 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.24 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 189 - 1.732" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.12 / 4 |
| Firebox Area (sq ft / m2) | 86.76 / 8.06 |
| Grate Area (sq ft / m2) | 15.93 / 1.48 |
| Evaporative Heating Surface (sq ft / m2) | 1084 / 100.68 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1084 / 100.68 |
| Evaporative Heating Surface/Cylinder Volume | 176.14 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2772 |
| Same as above plus superheater percentage | 2772 |
| Same as above but substitute firebox area for grate area | 15,096 |
| Power L1 | 4506 |
| Power MT | 294.51 |