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
Harveyqs 
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.