A vehicle-to-vehicle connection comprising a plurality of power cable polymer joints, each power cable polymer joint comprising an insulator tube comprising a cable insertion hole (2a, 2b) into which a stripped end portion of a power cable is inserted, wherein the power cable comprises a conductor, an insulation layer, a shield layer and a sheath layer, a conductor-connecting rod connected to the conductor of the power cable, a fixing terminal to which the conductor-connecting rod is attached, and a high-voltage shield connected to the conductor-connecting rod via the fixing terminal, wherein the insulator tube comprises: an insulation comprising a polymer-based material; an embedded pipe comprising a metal and embedded on an inner peripheral surface of the insulation so as to face the end portion of the power cable; a first semi-conductive portion comprising mainly a polymer-based material and covering an outer peripheral surface of the embedded pipe; an embedded flange comprising a metal and embedded in the insulation on a side of the outer peripheral surface such that a mounting surface to be attached to another member is exposed from the insulation; and a second semi-conductive portion comprising mainly a polymer-based material and covering a surface of the embedded flange except a portion exposed from the insulation; wherein the plurality of power cable polymer joints include a first power cable polymer joint and a second power cable polymer joint, wherein the first power cable polymer joint is configured to be placed on a roof of a first railway vehicle in a cantilever manner; wherein the second power cable polymer joint is configured to be placed on a roof of a second railway vehicle in a cantilever manner; and wherein the first power cable polymer joint and the second power cable polymer joint are connected by a flexible electric wire and arranged such that the first power cable polymer joint and the second power cable polymer joint are opposite to each other. an insulation comprising a polymer-based material; an embedded pipe comprising a metal and embedded on an inner peripheral surface of the insulation so as to face the end portion of the power cable; a first semi-conductive portion comprising mainly a polymer-based material and covering an outer peripheral surface of the embedded pipe; an embedded flange comprising a metal and embedded in the insulation on a side of the outer peripheral surface such that a mounting surface to be attached to another member is exposed from the insulation; and a second semi-conductive portion comprising mainly a polymer-based material and covering a surface of the embedded flange except a portion exposed from the insulation; wherein the plurality of power cable polymer joints include a first power cable polymer joint and a second power cable polymer joint, wherein the first power cable polymer joint is configured to be placed on a roof of a first railway vehicle in a cantilever manner; wherein the second power cable polymer joint is configured to be placed on a roof of a second railway vehicle in a cantilever manner; and wherein the first power cable polymer joint and the second power cable polymer joint are connected by a flexible electric wire and arranged such that the first power cable polymer joint and the second power cable polymer joint are opposite to each other.