Data from US Military Railway Service Equipment Data Book -- German Locomotives supplied from the extensive collection of Allen Stanley (March 2004). Also used the Google-translated account at [] (accessed 25 April 2004)--the link was no longer active in 2021.(Thanks to Piotr Staszewski for his 11 September 2021 email noting the sequence of events that led to the Polish State Railways Okl 101 designation.)
Although there were detail differences, all of the locomotives in this class of commuter tanks had Belpaire fireboxes and two steam domes connected by an external dry pipe. These were the heaviest Prairie tanks operated by a German railway and proved to be powerful and reliable. They were rated at 750 tons on the level at 75 km/h (47 mph), 400 tons up a 1/2% grade at 65 km/h (40 mph), and 320 tons up 1% reaching 50 km/h (31 mph).
The first batch had full-height water tanks extending forward to the stack while later examples had a tapered section to improve visibility. One difference among batches was the engine weight which spanned a six-short-ton range.The 1917-1921 locomotives were delivered with a feedwater heater.
Piotr Staszewski emailed a correction on the Polish locomotives. He notes that they were transferred by the German Army to occupied "Russian Poland" during WW1, remained in newly independent Poland and were taken into the Polish State railways as Okl 101
Although a few were transferred to Poland (11 as Ok 101), France (8) , and Belgium (4) in 1919 as war reparations,
83 of those remaining were taken into the DRG in 1925. Five of them had larger superheaters when classified, but were apparently modified to match the rest before 1945.
After World War II, 89 locomotives of this design -- some of which had been "reclaimed" when Nazi Germany invaded both Poland and France -- were available for service. At least 30 still survived in East German service in the mid-1960s. A museum display -- 75 515 -- is credited with 66 years of operation and 2 1/2 million kilometers (1.55 million miles) run.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | XIV HT/BR 75.5 |
Locobase ID | 6011 |
Railroad | Saechsischen (Saxon) Staats-Eisenbahnen |
Country | Germany |
Whyte | 2-6-2T |
Number in Class | 106 |
Road Numbers | 75 501-505, 511-550, 551- |
Gauge | Std |
Number Built | 106 |
Builder | Hartmann |
Year | 1911 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 12.47 / 3.80 |
Engine Wheelbase (ft / m) | 28.54 / 8.70 |
Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
Overall Wheelbase (engine & tender) (ft / m) | 28.54 / 8.70 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 36,597 / 16,600 |
Weight on Drivers (lbs / kg) | 108,247 / 49,100 |
Engine Weight (lbs / kg) | 174,681 / 79,234 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 2112 / 8 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 60 / 30 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 62.60 / 1590 |
Boiler Pressure (psi / kPa) | 174 / 1200 |
High Pressure Cylinders (dia x stroke) (in / mm) | 21.65" x 23.62" / 550x600 |
Tractive Effort (lbs / kg) | 26,157 / 11864.63 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.14 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 132 - 2.008" / 51 |
Flues (number - dia) (in / mm) | 24 - 5" / 127 |
Flue/Tube length (ft / m) | 13.12 / 4 |
Firebox Area (sq ft / m2) | 128.09 / 11.90 |
Grate Area (sq ft / m2) | 24.76 / 2.30 |
Evaporative Heating Surface (sq ft / m2) | 1326 / 123.23 |
Superheating Surface (sq ft / m2) | 375 / 34.85 |
Combined Heating Surface (sq ft / m2) | 1701 / 158.08 |
Evaporative Heating Surface/Cylinder Volume | 131.76 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4308 |
Same as above plus superheater percentage | 5256 |
Same as above but substitute firebox area for grate area | 27,191 |
Power L1 | 9635 |
Power MT | 588.70 |