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.^[1]

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 All scrapped, 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.^[1] 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-150

Built in 1935:

• Sk-160
• Sk-161
• Sk-162

Built 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