Data from data table entry "F1, Vk6 Pyorasto 0-4-4-T" supplied by Teemu Koivumaki in a 20 January 2022 email that supplied much of the detail in this entry. Works numbers were 1023-1024 in 1897.
The Swiss builder supplied eight Forney-type tank locomotives to three different Finnish railways. These were the only 0-4-4Ts to enter Finnish service. A quartet of Finnish State engines appear in Locobase 20979, an additional pair sent to the Porvoo-Kerava are found in 20980.
Both P-K Forneys went out of service in February and March 1935, respectively.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | F1/Vk6 |
| Locobase ID | 20981 |
| Railroad | Rauman |
| Country | Finland |
| Whyte | 0-4-4T |
| Number in Class | 2 |
| Road Numbers | 70-71 |
| Gauge | 5' |
| Number Built | 2 |
| Builder | SLM |
| Year | 1897 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5.58 / 1.70 |
| Engine Wheelbase (ft / m) | 16.24 / 4.95 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.34 |
| Overall Wheelbase (engine & tender) (ft / m) | 16.24 / 4.95 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 17,196 / 7800 |
| Weight on Drivers (lbs / kg) | 33,290 / 15,100 |
| Engine Weight (lbs / kg) | 57,541 / 26,100 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 57,541 / 26,100 |
| Tender Water Capacity (gals / ML) | 528 / 2 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.80 / 1.60 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 28 / 14 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 49.20 / 1250 |
| Boiler Pressure (psi / kPa) | 142.10 / 980 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12.2" x 20.08" / 310x510 |
| Tractive Effort (lbs / kg) | 7337 / 3328.01 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.54 |
| 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) | 9.69 / 0.90 |
| Evaporative Heating Surface (sq ft / m2) | 431 / 40 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 431 / 40 |
| Evaporative Heating Surface/Cylinder Volume | 158.64 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1377 |
| Same as above plus superheater percentage | 1377 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |