Polish State Rwys 4-8-2 Locomotives in Poland


Class Details by Steve Llanso of Sweat House Media

Class Pu-29 (Locobase 1683)

Thomasz Galka's [] (23 July 2004) is the main source for data.

Galka comments: "Due to the axle arrangement, running was very smooth. Crews praised good visibility and easy access to the running gear and brakes. Fuel consumption, despite live-steam injectors of excessive output, was comparatively low." But he and Durrant 1966) note that this might have been a standard express locomotive in Poland, but they were too long for many of the existing turntables. So their principal dimensions were repeated in the Pt-31s (Locobase 1681), which, as Mikados, had shorter wheelbases.

A[nthony] E[dward] Durrant, The steam loc's assessment of this class as the "most elegant of all Polish locomotives" is difficult to challenge, as photographs show these engines to have had excellent Mountain lines.

Two of the three fell into Soviet hands and were not returned. The third was used by the German railway in Poland during the war and returned to Poland in 1950. It ran for another 20 years before retiring in 1970.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassPu-29
Locobase ID1683
RailroadPolish State Rwys
CountryPoland
Whyte4-8-2
Number in Class3
Road Numbers
GaugeStd
Number Built3
BuilderCegielski
Year1930
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)19.69 / 6
Engine Wheelbase (ft / m)43.31 / 13.20
Ratio of driving wheelbase to overall engine wheelbase 0.45
Overall Wheelbase (engine & tender) (ft / m)69.21 / 21.10
Axle Loading (Maximum Weight per Axle) (lbs / kg)40,785 / 18,500
Weight on Drivers (lbs / kg)160,055 / 72,600
Engine Weight (lbs / kg)250,886 / 113,800
Tender Loaded Weight (lbs / kg)116,845 / 53,000
Total Engine and Tender Weight (lbs / kg)367,731 / 166,800
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)67 / 33.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72.80 / 1850
Boiler Pressure (psi / kPa)217.60 / 15
High Pressure Cylinders (dia x stroke) (in / mm)24.8" x 27.6" / 630x701
Tractive Effort (lbs / kg)43,128 / 19562.55
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.71
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)21.33 / 6.50
Firebox Area (sq ft / m2)199.06 / 18.50
Grate Area (sq ft / m2)51.65 / 4.80
Evaporative Heating Surface (sq ft / m2)2480 / 230.50
Superheating Surface (sq ft / m2)934 / 86.80
Combined Heating Surface (sq ft / m2)3414 / 317.30
Evaporative Heating Surface/Cylinder Volume160.72
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,239
Same as above plus superheater percentage14,274
Same as above but substitute firebox area for grate area55,011
Power L120,329
Power MT1120.06

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