A vehicular system comprising: a vehicle including a plurality of cars which are connected to each other, each car having a roof that is grounded and a floor; a plurality of power-receiving vacuum circuit breakers arranged under the floor of the vehicle; a plurality of main transformers (Tr) arranged under the floor of the vehicle; and a plurality of high-voltage drawing-in cables arranged on the roof of the vehicle, wherein the high-voltage drawing-in cables are connected to each other at portions between the cars with straight joints and are branched at T-shaped branching joints in a downward direction towards the floor of the vehicle directly connecting a primary side of one of the power-receiving vacuum circuit breakers to which one of the main transformers (Tr) is connected to a secondary side, said straight joints and the T-shaped branching joints are arranged on the roof; and wherein the T-shaped branching joints, which are arranged on the roof and so as to be substantially parallel to the roof, comprises: a first T-shaped cable head; a second T-shaped cable head; a third T-shaped cable head; a switch including a fixed electrode and a movable electrode; a first bushing conductor connected to one of the fixed electrode and the movable electrode; and a second bushing conductor connected to another of the fixed electrode and the movable electrode, wherein the first T-shaped cable head has one end connected to the first bushing conductor, wherein the second T-shaped cable head is connected to an end of the first T-shaped cable head, which is different from the one end of the first T-shaped cable head, wherein the third T-shaped cable head has one end connected to the second bushing conductor, wherein the first T-shaped cable head and the second T-shaped cable head are connected to respective circuits, and wherein the first T-shaped cable head, the second T-shaped cable head, the third T-shaped cable head, and a surface of the switch are set to a ground potential. a vehicle including a plurality of cars which are connected to each other, each car having a roof that is grounded and a floor; a plurality of power-receiving vacuum circuit breakers arranged under the floor of the vehicle; a plurality of main transformers (Tr) arranged under the floor of the vehicle; and a plurality of high-voltage drawing-in cables arranged on the roof of the vehicle, wherein the high-voltage drawing-in cables are connected to each other at portions between the cars with straight joints and are branched at T-shaped branching joints in a downward direction towards the floor of the vehicle directly connecting a primary side of one of the power-receiving vacuum circuit breakers to which one of the main transformers (Tr) is connected to a secondary side, said straight joints and the T-shaped branching joints are arranged on the roof; and wherein the T-shaped branching joints, which are arranged on the roof and so as to be substantially parallel to the roof, comprises: a first T-shaped cable head; a second T-shaped cable head; a third T-shaped cable head; a switch including a fixed electrode and a movable electrode; a first bushing conductor connected to one of the fixed electrode and the movable electrode; and a second bushing conductor connected to another of the fixed electrode and the movable electrode, wherein the first T-shaped cable head has one end connected to the first bushing conductor, wherein the second T-shaped cable head is connected to an end of the first T-shaped cable head, which is different from the one end of the first T-shaped cable head, wherein the third T-shaped cable head has one end connected to the second bushing conductor, wherein the first T-shaped cable head and the second T-shaped cable head are connected to respective circuits, and wherein the first T-shaped cable head, the second T-shaped cable head, the third T-shaped cable head, and a surface of the switch are set to a ground potential. a first T-shaped cable head; a second T-shaped cable head; a third T-shaped cable head; a switch including a fixed electrode and a movable electrode; a first bushing conductor connected to one of the fixed electrode and the movable electrode; and a second bushing conductor connected to another of the fixed electrode and the movable electrode, wherein the first T-shaped cable head has one end connected to the first bushing conductor, wherein the second T-shaped cable head is connected to an end of the first T-shaped cable head, which is different from the one end of the first T-shaped cable head, wherein the third T-shaped cable head has one end connected to the second bushing conductor, wherein the first T-shaped cable head and the second T-shaped cable head are connected to respective circuits, and wherein the first T-shaped cable head, the second T-shaped cable head, the third T-shaped cable head, and a surface of the switch are set to a ground potential.