Pfalzbahn 2-6-4 Locomotives in Germany


Class Details by Steve Llanso of Sweat House Media

Class P5 // BR 77.0 (Locobase 5754)

Data from Christian Lindecke's website [link] (visited 28 Nov 2003). Additional data from US Military Railway Service Equipment Data Book -- German Locomotives supplied by Allen Stanley from his extensive Rail Data Exchange in March 2004

The dozen tanks were designed to run at 80 km/h (50 mph) in either direction. A Krauss-Helmholz truck linked the carrying axle and the first coupled axle; the second coupled axle was the drive axle.

Before long the class was equipped with the Pielock superheater (see Locobase 13565 for a detailed description of this unit). This design proved unsatisfactory and the class was retrofitted with the Schmidt version in 1925. Locobase 5755 shows the later superheated locomotives which, other than a slightly larger boiler, had very similar dimensions.

Nine were still operational after World War II, most being sold off to private railways. The last DB engine left service on 14 November 1951.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassP5 // BR 77.0
Locobase ID5754
RailroadPfalzbahn
CountryGermany
Whyte2-6-4T
Number in Class12
Road Numbers310-321 / BR 77 001- BR 77 012
GaugeStd
Number Built12
BuilderKrauss
Year1908
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.82 / 3.60
Engine Wheelbase (ft / m)30.85 / 9.40
Ratio of driving wheelbase to overall engine wheelbase 0.38
Overall Wheelbase (engine & tender) (ft / m)30.85 / 9.40
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,715 / 16,200
Weight on Drivers (lbs / kg)105,822 / 48,000
Engine Weight (lbs / kg)202,825 / 92,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)202,825 / 92,000
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)59.10 / 1501
Boiler Pressure (psi / kPa)203.10 / 1400
High Pressure Cylinders (dia x stroke) (in / mm)19.69" x 22.05" / 500x560
Tractive Effort (lbs / kg)24,971 / 11326.67
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.24
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.12 / 4
Firebox Area (sq ft / m2)107 / 9.94
Grate Area (sq ft / m2)25.18 / 2.34
Evaporative Heating Surface (sq ft / m2)1499 / 139.31
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1499 / 139.31
Evaporative Heating Surface/Cylinder Volume192.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5114
Same as above plus superheater percentage5114
Same as above but substitute firebox area for grate area21,732
Power L15236
Power MT327.25

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