Jockis-Forssa-jSrnvSgen 2-8-2 Locomotives in Finland

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 12398)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 22, p. 242. See also the Jokionen Museum Railway site at [] . Works number was 17346 in January 1900.

Sized for the light rail and tight clearances of a narrow-gauge railway, this 8-coupled had leading and trailing trucks to enable to traverse 100-metre-radius curves, operate on 30-lb/yard (15-kg/metre) rail, scale 1.6% grades, and cover the line's 100 km (62 miles).

A note in the specs reports that the tanks' capacity was reduced from 1,000 gallons to bring the engine weight down from 67,955 lb to 64,308 lb. "Pay special attention," the Baldwin rep added, "that actual weight does not exceed this."

Ultimately it didn't matter - the locomotive was still too heavy. So the 3 was sold off to Estonia (then in Russia) where it served the enormous fortress complex at Reval.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID12398
RailroadJockis-Forssa-jSrnvSgen (JFJ)
Number in Class1
Road Numbers3
Gauge75 cm
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59
Engine Wheelbase (ft / m)21.17 / 6.45
Ratio of driving wheelbase to overall engine wheelbase 0.40
Overall Wheelbase (engine & tender) (ft / m)21.17 / 6.45
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)43,600 / 19,777
Engine Weight (lbs / kg)62,300 / 28,259
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)62,300 / 28,259
Tender Water Capacity (gals / ML)850 / 3.22
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)18 / 9
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)30 / 762
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)13" x 16" / 330x406
Tractive Effort (lbs / kg)12,258 / 5560.14
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.56
Heating Ability
Tubes (number - dia) (in / mm)93 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.75 / 3.58
Firebox Area (sq ft / m2)44 / 4.09
Grate Area (sq ft / m2)10 / 0.93
Evaporative Heating Surface (sq ft / m2)540 / 50.17
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)540 / 50.17
Evaporative Heating Surface/Cylinder Volume219.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1600
Same as above plus superheater percentage1600
Same as above but substitute firebox area for grate area7040
Power L12474
Power MT500.39

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Wes Barris