Polish State Rwys 4-6-2 Locomotives in Poland

Class Details by Steve Llanso of Sweat House Media

Class Pm36 (Locobase 1680)

Data from Tomas Galka, "Pm36", on Standard-Gauge Locomotives in Poland at [], last accessed 5 October 2022.

The only Polish Pacifics and Polish record-holders in boiler pressure and driver diameter. Although competent, they were overtaken by the war and not repeated. The first engine was fully streamlined, the second--Pm36-2--was fitted with a double Kylchap blastpipe.

Galka summarizes the range of opinions about the quality and importance of this pair of high-achieving runners: "Some claim that it was a product of profound ambition, which ignored actual demands; the other will argue that it is the best steam locomotive ever built in Poland (which is not the case). From the technical point of view it compared well with foreign counterparts; aesthetically it was certainly excellent, if not perfect. Its contribution to the development and history of steam traction in Poland was marginal; but, by a strange decree of fate, it is certainly the most famous Polish locomotive."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID1680
RailroadPolish State Rwys
Number in Class2
Road Numbers
Number Built2
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.11 / 4.30
Engine Wheelbase (ft / m)22.31 / 6.80
Ratio of driving wheelbase to overall engine wheelbase 0.63
Overall Wheelbase (engine & tender) (ft / m)39.21 / 11.95
Axle Loading (Maximum Weight per Axle) (lbs / kg)39,242 / 17,800
Weight on Drivers (lbs / kg)113,758 / 51,600
Engine Weight (lbs / kg)210,321 / 95,400
Tender Loaded Weight (lbs / kg)154,764 / 70,200
Total Engine and Tender Weight (lbs / kg)365,085 / 165,600
Tender Water Capacity (gals / ML)8353 / 31.64
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 9.90 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)63 / 31.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78.70 / 2000
Boiler Pressure (psi / kPa)261.10 / 18
High Pressure Cylinders (dia x stroke) (in / mm)20.87" x 27.56" / 530x700
Tractive Effort (lbs / kg)33,851 / 15354.57
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.36
Heating Ability
Tubes (number - dia) (in / mm)113 - 2.047" / 52
Flues (number - dia) (in / mm)30 - 5.236" / 133
Flue/Tube length (ft / m)19.69 / 6
Firebox Area (sq ft / m2)161.46 / 15
Grate Area (sq ft / m2)41.55 / 3.86
Evaporative Heating Surface (sq ft / m2)2165 / 201.10
Superheating Surface (sq ft / m2)766 / 71.10
Combined Heating Surface (sq ft / m2)2931 / 272.20
Evaporative Heating Surface/Cylinder Volume198.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,849
Same as above plus superheater percentage13,669
Same as above but substitute firebox area for grate area53,118
Power L130,966
Power MT1800.36

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