Franz Krull Sk class
Introduction The '''Franz Krull''' '''''Sk'''''-'''class''' is a class of steam locomotive built by the Franz Krull metal works of Tallinn, Estonia between 1931-1940.The ''Sk'' were narrow-gauged and used oil shale as fuel, since it is the primary energy source in Estonia. A total of 16 units were produced, of which none has survived. The last ''Sk'', ''Sk-156'', was scrapped in 1980 in Beloretsk, Russia, where it was actively used until scrapping.
List of ''Sk'' locomotives Sk-155 after the railway accident between stations Võhma and Olustvere.Built in 1931:*Sk-151*Sk-152*Sk-153*Sk-154*Sk-155*Sk-156*Sk-157*Sk-158*Sk-159*Sk-150Built in 1935:*Sk-160*Sk-161*Sk-162Built in 1940:(During the first Soviet occupation of Estonia, when the factory was renamed "Punane Krull" ("Red Krull"). These locomobiles were decorated by the red star and hammer and stickle figures. )*Sk-163*Sk-164*Sk-165
References
External links *  Mulgi Railway*  History of Estonian narrow-gauge railways (in Estonian)