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 511 in 1888 and 1153 in 1898.
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 Rauman Railway are found in 20981.
Porvoo port lies on Finland's south coast of the Gulf of Finland. The P-K runs from Porvoo west about 39 km (24 miles) to Kerava.
Note the long time between deliveries.
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 | 20980 |
| Railroad | Porvoo-Kerava |
| Country | Finland |
| Whyte | 0-4-4T |
| Number in Class | 2 |
| Road Numbers | 63-64 |
| Gauge | 5' |
| Number Built | 2 |
| Builder | SLM |
| Year | 1888 |
| 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) | |
| 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 | |