0-8-0 Steam Locomotives in Russia

Class On-superheated (Locobase 21225)

Data from "Diagrams [of] Locomotives and Tender", published in Moskva (Moscow), 1935), pp. 61-62, PDF supplied by Teemu Koivmaki in his 5 October 2019 email. (Many thanks to Teemu for sending what might never have fallen into Locobase's hands. An indispensable addition to Locobase's resources). See also on the loco-info.com-the reference for locomotives and railcars website at []

Locobase 4239 describes the original Russian State Railways saturated-steam compound eight-coupled goods whose production run in 1890 eventually totalled over 9,000 locomotives.

Although virtually all of the class followed this basic layout, a few engines appeared that took the basic engine and transformed it into a superheated, two-cylinder simple freight locomotive between 1908 and 1915. Cylinder diameter increased slightly over the simpled Od and the boiler held 81 fewer small tubes than the original engines to make room for the 18 superheater flues. 250 mm piston valves replaced the original slide valves.

It's not clear how many such rebuilds rolled out, but Russian involvement in World War I doubtless considerably limited conversions.

Class On-superheated (Locobase 21226)

Data from Kaiserlich Russische Eisenbahnen Serie ?", "Diagrams [of] Locomotives and Tender", published in Moskva (Moscow), 1935), pp. 61-62, PDF supplied by Teemu Koivmaki in his 5 October 2019 email. (Many thanks to Teemu for sending what might never have fallen into Locobase's hands. An indispensable addition to Locobase's resources). See also on the loco-info.com-the reference for locomotives and railcars website at []

Locobase 4239 describes the original Russian State Railways saturated-steam compound eight-coupled goods whose production run in 1890 eventually totalled over 9,000 locomotives.

Although virtually all of the class followed this basic layout, a few engines appeared that took the basic engine and transformed it into a superheated, two-cylinder simple freight locomotive between 1908 and 1915; see Locobase 21225.

After the October Revolution, the Civil War, and Lenin's death, the Soviet State Railways produced 72 more superheated engines from 1926 to 1928. As with many such updates, the shops left the firebox and grate untouched and worked within the constraints of the existing boiler. Slide valves gave way to 250-mm diameter piston valves.

The SDZ diagram's tube and flue heating surface areas derive from the cylinders' internal (fire side) diameters of 46 and 125 mm, respectively. Tube and flue areas together with firebox surface area came to 126.94 sq m (1,366 sq ft). Locobase used the external dimensions (water side) in its data table.