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EN57 is an electric multiple unit used by the Polish railway operator (''PKP''). It was built for suburban and long-distance services. Presently it is used by Przewozy Regionalne, Szybka Kolej Miejska and Koleje Mazowieckie companies. Out of over 1400 units produced, about 1000 still remain in service in Poland, most of them with Przewozy Regionalne. ==History== Designed for regional transport class EN57 was based on the earlier class EW55 units. EW55 were the first electrical multiple units built in Poland. They were built by Pafawag works in Wrocław. Production started in 1962 and ended in 1993 with 1412 units produced, most of which are still in operation. This class is believed to have had the longest production period in the world for electric multiple units. The first units had first class compartments, but units numbered 602 and upwards were produced with only second class. Due to very long production period the series varies between specific production spans. Units up to number 1113 have corrugated sides and three windscreens, units numbered 1114 to 1825 have flat sides and three windscreens, whilst units from number 1900 up to 1953 have flat sides and two windscreens, resembling class EW58 units. As the result of several fires and accidents, units numbered 201 to 206 are assembled from surviving cars of previously destroyed units. Since 2006, Przewozy Regionalne have modernized several units with funding from the European Union. The changes affect the appearance of the units, with the ends being redesigned. The interior was also changed. Mechanical and electric devices remain mostly unchanged. Modified units are being renumbered from 2001 upwards. Classes EN71, ED72, and ED73 units were based on class EN57. Szybka Kolej Miejska which operates service in the Tricity area uses these units and has also modernized them, this being mostly to the interior. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PKP class EN57」の詳細全文を読む スポンサード リンク
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