Franz Krull Sk class

The Franz Krull Sk-class is a class of steam locomotive built by the Franz Krull metal works of Tallinn, Estonia between 1931-1940.

Franz Krull Sk class
Sk-154
Type and origin Power type Steam Designer A. Borsig works, Berlin, Germany Builder AS Franz Krull, Tallinn, Estonia Build date 1931-1940 Total produced 16
Specifications Configuration: ​  • Whyte 2-8-0  • UIC 1′D h2 Gauge 750 mm (2 ft 5 1⁄2 in) narrow gauge Driver dia. 900 mm (2 ft 11 3⁄8 in) Fuel type Oil shale Fuel capacity 8 tons Water cap 6 tons Boiler pressure 13 atm (1.32 MPa; 191 psi) Cylinders Two Cylinder size 380 mm × 450 mm (14 15⁄16 in × 17 11⁄16 in)
Career Operators Estonian Railways Disposition None preserved

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.