Władysław Gomułka
Three units of class EN57 EMU were exported to Yugoslavia in 1964, where they classified "311-0" (for trailers) and "315-0" (for motor cars). Another eleven were subsequently rebuilt from class "315-1" with additional trailers. As in the time of delivery Władysław Gomułka was the leader of Polish Polish United Workers' Party, those items were nicknamed after him.