Data from users.skynet.be/korm/nostalgia/stock_loco.html#tubize2369 (10 July 2004).
The tables on this site for both locomotives show 15 sq m for the heating surface, which is much too low. Locobase suspects the real figure to be approx 50 sq m.
The J-F, soon redubbed the Jokionen, was principally a freight line, according to the museum site: "Originally the railway was built to serve the needs of the expanding industries in Jokioinen and Forssa. Forssa produced cotton fabrics, and Jokioinen's metal factory needed an easy outlet for its products via the broad gauge network of the Finnish State Railways at Koivisto (now Humppila) station, and thence to world markets. Most of the raw materials for local industries were also transported on the Jokioinen Railway."
In later years, after the rails had been beefed up to 45-lb/yd (22.3 kg/m), the JR would have its greatest traffic. "The best year for freight traffic was 1940, during the short peace between the Winter War and the Continuation War, when a total of 90,000 tons of freight was carried on the Railway. The top year for passenger traffic was just after the Wars in 1945, when an annual total of 402,254 passengers was carried on the railway."
This pair of pint-sized Prairie tanks (works # 2365 and 2369) were built for the JR to replace Henschel locomotives that had to be surrendered to the Soviet Union as reparations after World War II. Their use declined in the 1960s and the locomotives went out of service in 1972.
Both were returned to active service. In 1983 the Welshpool and Llanfair Light Railway (2' 6" or 762-mm gauge) bought #5 and after years of effort returned it to service as their Orion (#15). After operations on the W&LLR showed the JR 5 to be too heavy, the Jokiosten offered to buy it back and the W&LLR agreed in 1986.
The JR took #4 under care and restored it in the 1980s to museum-road service as well.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 6219 |
| Railroad | Jokioisten Railway |
| Country | Finland |
| Whyte | 2-6-2T |
| Number in Class | 2 |
| Road Numbers | 4-5 |
| Gauge | 75 cm |
| Number Built | 2 |
| Builder | Tubize |
| Year | 1947 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | 79,366 / 36,000 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 79,366 / 36,000 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 37 / 940 |
| Boiler Pressure (psi / kPa) | 188.50 / 1300 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12.6" x 17.72" / 320x450 |
| Tractive Effort (lbs / kg) | 12,182 / 5525.67 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 14.53 / 1.35 |
| Evaporative Heating Surface (sq ft / m2) | 161 / 15 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 161 / 15 |
| Evaporative Heating Surface/Cylinder Volume | 62.96 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2739 |
| Same as above plus superheater percentage | 2739 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |