PKP classification system

PKP classification system (Polish locomotive designation) is a system of assigning letters and numbers to series and individual locomotives used by the PKP - Polish national railroad operator.

The system was introduced for the steam stock by the Ministry of Railways on 3 November 1922, shortly after Poland regained her independence (1918) when the Polish railroads inherited a variety of German, Austrian and Russian steam locomotives, each with its own type convention.

After World War II a similar system was also adapted for diesel and electric locomotives.

Digits mark subsequent classes, and their ranges also carry additional information on construction features.

A tender numbered 22D23 can carry up to 22 m3 of water, has four axles, and its construction was approved in 1923.

An example of a locomotive designation: E stands for electric locomotive and T stands for freight locomotive. Next two numbers ( 22 ) describe six axles, Co-Co , direct current , 3 kV. Next four numbers after dash are an inventory number.
Diesel ( S ) shunting ( M ) maneuvering locomotive, no multiple-unit control (01-09 number range)
An example of a Ty43 class locomotive designation: T stands for freight locomotive and y stands for 2-10-0 wheel set. 43 describes Polish production, 1943 year of design approval.