Data from "Baureihe 73.0" on Albert Gieseler's Dampmaschinen und Lokomotiven website at [], last accessed 12 September 2024. Krauss Munich works numbers were 4350, 4370-4372 in 1900, 4606-4620 in 1901. Maffei works numbers were 2256-2263 in 1902, 2288-2289 in 1903.
As Kruass's D XII design proved itself in the Munich suburbs (Locobase 5931), the Pfalzbahn procured 31 more from 1900 to 1903 and the Elass-Lothringen (Alsace-Lorraine) railway bought 37 from 1903-1912 (see Locobase 15589).
In 1907, another nine locomotives for the Pfalzbahn - now designated Pt 2/5 N -- that put another 1.3 metric tons on the drivers were built to the same dimensions.
NB: German sources give the tube diameter as 45 mm, as shown in Locobase's specs, but also calculate the tube heating surface as 104.64 sq m (1,126 sq ft). The latter figure equates to an inside (fire side) tube diamter of 40 mm (1.57").
The Pt 2/5 N class also came over as DRG 73 131-173 139 as well as DRG 73 201-202. Like the earlier engines, they left service in 1931-1935.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | D XIIe / BR 73.0 |
| Locobase ID | 21203 |
| Railroad | Pfalzbahn (Palatinate) |
| Country | Germany |
| Whyte | 2-4-4T |
| Number in Class | 63 |
| Road Numbers | 88-95, 260-282, 284 / 73 001-73.028 |
| Gauge | Std |
| Number Built | 63 |
| Builder | several |
| Year | 1900 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.73 / 2.05 |
| Engine Wheelbase (ft / m) | 28.87 / 8.80 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.23 |
| Overall Wheelbase (engine & tender) (ft / m) | 28.87 / 8.80 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 32,187 / 14,600 |
| Weight on Drivers (lbs / kg) | 65,257 / 29,600 |
| Engine Weight (lbs / kg) | 149,473 / 67,800 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2402 / 9.10 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 54 / 27 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 64.60 / 1641 |
| Boiler Pressure (psi / kPa) | 174 / 1200 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17.72" x 22.05" / 450x560 |
| Tractive Effort (lbs / kg) | 15,852 / 7190.35 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.12 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 200 - 1.772" / 45 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.57 / 3.83 |
| Firebox Area (sq ft / m2) | 92.89 / 8.63 |
| Grate Area (sq ft / m2) | 21.10 / 1.96 |
| Evaporative Heating Surface (sq ft / m2) | 1271 / 118.08 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1271 / 118.08 |
| Evaporative Heating Surface/Cylinder Volume | 201.95 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3671 |
| Same as above plus superheater percentage | 3671 |
| Same as above but substitute firebox area for grate area | 16,163 |
| Power L1 | 5166 |
| Power MT | 349.05 |