Polish State Rwys 2-10-2 Locomotives in Poland

Class Details by Steve Llanso of Sweat House Media

Class Okz-32 (Locobase 1688)

Data from Tomas Galka's English-language Polish locomotives website [], last accessed 10 January 2007.

An unusual wheel arrangement for a passenger tank engine. Although they resembled the Ty-23 tender engine," the motion was completely redesigned, and the cylinders, which were smaller both in diameter and stroke, had straight ports and large-diameter piston valves." [A[nthony] E[dward] Durrant, The steam loc]. The tank engine also worked a smaller boiler at a higher pressure.

See thread in [] . The design was a success and lasted to the end of steam.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID1688
RailroadPolish State Rwys
Number in Class25
Road Numbers
Number Built25
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)21 / 6.40
Engine Wheelbase (ft / m)38.39 / 12.05
Ratio of driving wheelbase to overall engine wheelbase 0.55
Overall Wheelbase (engine & tender) (ft / m)38.39 / 12.05
Axle Loading (Maximum Weight per Axle) (lbs / kg)37,479 / 17,000
Weight on Drivers (lbs / kg)187,393 / 85,000
Engine Weight (lbs / kg)261,027 / 118,400
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)261,027 / 118,400
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57.10 / 1450
Boiler Pressure (psi / kPa)217.60 / 15
High Pressure Cylinders (dia x stroke) (in / mm)24.8" x 27.56" / 630x700
Tractive Effort (lbs / kg)54,907 / 24905.43
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.41
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.76 / 4.50
Firebox Area (sq ft / m2)145.26 / 13.50
Grate Area (sq ft / m2)40.89 / 3.80
Evaporative Heating Surface (sq ft / m2)1981 / 184.10
Superheating Surface (sq ft / m2)710 / 66
Combined Heating Surface (sq ft / m2)2691 / 250.10
Evaporative Heating Surface/Cylinder Volume128.57
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8898
Same as above plus superheater percentage11,211
Same as above but substitute firebox area for grate area39,827
Power L112,226
Power MT719.18

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