Finnish Railway series G1, G2 and G4 “Pikku-Rusko”
Finnish Railway class Sk1
Finland 1884 51 produced
These locomotives were built from 1884 by the Swiss SLM for the Finnish State Railways. They were intended for mixed service and were called “Pikku-Rusko”, which means “Little Brown”. Since only low axle loads and a maximum speed of 40 km/h were permitted in Finland, the locomotives could be developed cheaply and with a simple chassis based on the American model.
The chassis with the 2-6-0 wheel arrangement could therefore be designed with a simple Bissel axle and a relatively large wheel base. They burned the wood available in abundance in Finland and had a boiler with an inner lining of asbestos and wood. The grate was provided with only a few air gaps so as not to suck in too much cold air.
Technical data
General
- Built
- 1884-1896
- Manufacturers
- SLM
- Wheel arrangement
- 2-6-0 (Mogul)
- Gauge
- 1,520 mm (Russian broad gauge)
Dimensions and weights
- Length
- 12.80 m
- Wheelbase
- 5.70 m
- Service mass
- 26.6 t
- Adhesion mass
- 21.1 t
- Total mass
- 40.4 t
- Rigid wheelbase
- 3.67 m
- Axle load
- 7.5 t
- Water capacity
- 5,000 l
- Fuel capacity
- 6 t (wood)
Boiler
- Grate area
- 1.11 m²
- Firebox surface
- 6.6 m²
- Tube heating surface
- 61.68 m²
- Evaporative heating surface
- 68.28 m²
- Total heating surface
- 68.3 m²
Power plant
- Driver diameter
- 1,245 mm
- Boiler pressure
- 10.3 bar
- Expansion type
- simple expansion
- Cylinders
- two, 380 x 510 mm
Power
- Power source
- steam
- Estimated power
- 170 kW (231 PS)
- Top speed
- 60 km/h
- Starting effort
- 51.8 kN
Calculated values
- Factor of adhesion
- 1 : 4.00
- Optimal speed
- 19 km/h
- Power-to-weight ratio
- 6.4 kW/t
- Heating Surface Equivalent
- 101.3 m²
- Cylinder volume/HSE
- 1 : 1,142.18
- Adhesive weight/Total
- 1 : 1.26
- Tractive force/Heating surface
- 1 : 15.84
- Grate area/Heating surface
- 1 : 61.51
- Firebox/Tube surface
- 1 : 9.35
