 PK-305 are manufactured by the Electric Locomotive Plant of Novocherkassy.In order to unload the power source of cab car, and decrease the voltage drop in train wires, the part of supplementary contactors and withholding coils of quick switches are powered by power source of their own section (neighboring trailer car)

The power controller is under the acceleration relay in case of manual starting.In case of automatic starting controller's shaft is turned to a next position, and the current in electric engine is brought down to 170 to 180 amperes.