 With this series having been connected to the 1380 series for test runs and out-of-service runs, it is theoretically possible to operate a train with this series connected to the 1380 series.However, the 5000 series has cars with only bench seats, as opposed to the 1380 series which, except for the ends of the cars, only has convertible forward- or backward-facing seats, so for the sake of this the two series are operated separately.The Ku 5000 and Mo 5150 cars are equipped with an auxiliary power unit supplied by 330 V DC from a DC to DC converter.