Christian Lindecke [] (visited 12 December 2003) for data. See also Wikipedia at [] . The numbers look good for these passenger tanks -- good factor of adhesion, high maximum speed (90 km/h // 56 mph), decent demand factors, the first Baden locomotives with Heusinger valve gear -- and they were derived from a design already tested on Switzerland's Gotthard Railway.
But they weren't a success, says Lindecke, being rough-riders at high speeds. So they operated in the Schwarzwald (Black Forest) for only five years before being superseded by IV E 4-6-0 locomotives. On other service, some endured long enough to be classed and numbered by the DRG in 1923 (71 7001-7005), but they were retired at about the same time.
NB: Tube diameter is estimated at 46.5 mm (1.83 inches) based on the known dimensions of number and length of tubes and firebox and evaporative heating surface areas.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | IVd / BR 71.70 |
| Locobase ID | 5785 |
| Railroad | Groáherzoglich Badischen Staatseisenbahn (Baden State) |
| Country | Germany |
| Whyte | 2-4-2T |
| Number in Class | 18 |
| Road Numbers | 124-126, 130-140,177,196+ |
| Gauge | Std |
| Number Built | 18 |
| Builder | Maffei |
| Year | 1891 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 30,203 / 13,700 |
| Weight on Drivers (lbs / kg) | 60,407 / 27,400 |
| Engine Weight (lbs / kg) | 118,829 / 53,900 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1584 / 6 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.80 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 50 / 25 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 67.60 / 1716 |
| Boiler Pressure (psi / kPa) | 145 / 1000 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17.99" x 24.02" / 457x610 |
| Tractive Effort (lbs / kg) | 14,173 / 6428.77 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.26 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 174 - 1.811" / 46 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.44 / 4.40 |
| Firebox Area (sq ft / m2) | 79.33 / 7.37 |
| Grate Area (sq ft / m2) | 18.84 / 1.75 |
| Evaporative Heating Surface (sq ft / m2) | 1285 / 119.37 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1285 / 119.37 |
| Evaporative Heating Surface/Cylinder Volume | 181.84 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2732 |
| Same as above plus superheater percentage | 2732 |
| Same as above but substitute firebox area for grate area | 11,503 |
| Power L1 | 3888 |
| Power MT | 283.79 |