PKP Class EW90

The PKP Class EW90 (also nicknamed the "Ewunia" type EMUs) is a class of electric multiple units, built for Polish State Railways (PKP) after World War II had came to an end.
==History==
The PKP Class EW90 first began as the German ET 165 units, when those Electric Multiple Units were built in the time period between 1928 and 1936 specifically to serve on the Berlin S-Bahn lines in Germany.
While many examples of this type were destroyed or wrecked during World War II, 189 ET 165, ET 166 and ET 167 vehicles were stabled in Schweidnitz (Świdnica), which after 1945 became part of Poland.
As part of German reparations 54 examples were taken over by the Polish State Railways (PKP). From 1951 to 1957 some were refurbished in Lubań as EW90, EW91 and EW92 units to serve on the SKM lines in the Tricity area of Gdańsk, Sopot and Gdynia as it was necessary to rebuild a car to change the power supply from third rail system into pantographs.
The PKP Class EW90 EMUs finished their service in 1976 when the power supply on the SKM lines had changed from 800 V. into 3,000 V.
==Technical Specifications==
Each unit consisted of two cars each: engine car and trailer. It was possible to connect four units in order to gain an eight car train.
GBM-700 type electric engines were used in the Class EW90, Class EW91 and Class EW92 EMUs, they had four main poles and four commutation poles. Two-step reduction of engine excitation (up to 50%) is made by a short-circuit of parts by their main poles. Engine cooling is done by a fan that was installed on the engines' shafts.
== Gallery ==
File:ET 165 Wannseebahn 01.jpg|Berlin S-Bahn ET 165.
File:EW90-12.jpg
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