The reference for locomotives and railcars


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Finnish Railway series G1, G2 and G4 “Pikku-Rusko”
later class Sk1
Finland | 1884 | 51 produced
Die Lokomotive, May 1916

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.

No. 124 in the Hyvinkaa Railway Museum
No. 124 in the Hyvinkaa Railway Museum

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.

Axle config2-6-0 (Mogul) 
Gauge4 ft 11 13/16 in (Russian broad gauge)
Dimensions and Weights
Length41 ft 11 15/16 in
Wheelbase18 ft 8 7/16 in
Fixed wheelbase12 ft 0 1/2 in
Service weight58,643 lbs
Adhesive weight46,517 lbs
Total weight89,067 lbs
Axle load16,535 lbs
Water capacity1,321 us gal
Fuel capacity13,228 lbs (wood)
Power sourcesteam
Estimated power228 hp (170 kW)
Optimal speed12 mph
Top speed37 mph
Starting effort11,644 lbf
Power Plant
Driver diameter49 in
Boiler pressure149 psi
Expansion typesimple
Cylinderstwo, 14 15/16 x 20 1/16 in
Grate area11.9 sq ft
Firebox area71 sq ft
Tube heating area663.9 sq ft
Evaporative heating area735 sq ft
Total heating area735 sq ft
Calculated Values
steam locomotive
last changed: 04/2023

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