A wiring system for the electrical connection between a first and a second carriage of a railway vehicle, said wiring system including at least one mobile wiring having a first and a second end connected to a respective connector designed for coupling to fixed panel elements (8a, 8b) carried by facing outside walls of the first and respectively second carriages, wherein said mobile wiring has a single sheath enclosing a number of separate and distinct cables (11a-11d), each designed for a respective application, jointly designed to provide complete connectivity in terms of data and control signals between said first and second carriages, characterized in that said cables (11a-11d) consist of: a first cable with two conductors, wired in a respective dedicated shielded module; a second cable with four conductors, with controlled impedance, shielded and wired in its own dedicated module; a third cable with twelve conductors, shielded and wired in its own dedicated module; and a fourth cable, with four pairs of conductors of the AWG-23 cat-7a Ethernet data communication type; and in that said connector is designed for coupling to a panel connector fitted in the respective fixed panel element (8a, 8b) with a safety release mechanism for quick disconnection in case of separation between said first and second carriages; wherein said connector is modular and contains within it a number of separate connector modules (12a-12d), each connector module being dedicated to a respective one of said cables (11a-11d), being independently shielded and individually sealed: a first connector module, with two contacts, to receive the first cable; a second connector module, with four contacts, to receive the second cable; a third connector module, with twelve contacts, to receive the third cable; and a fourth connector module to accommodate the fourth cable. wherein said mobile wiring has a single sheath enclosing a number of separate and distinct cables (11a-11d), each designed for a respective application, jointly designed to provide complete connectivity in terms of data and control signals between said first and second carriages, characterized in that said cables (11a-11d) consist of: a first cable with two conductors, wired in a respective dedicated shielded module; a second cable with four conductors, with controlled impedance, shielded and wired in its own dedicated module; a third cable with twelve conductors, shielded and wired in its own dedicated module; and a fourth cable, with four pairs of conductors of the AWG-23 cat-7a Ethernet data communication type; and in that said connector is designed for coupling to a panel connector fitted in the respective fixed panel element (8a, 8b) with a safety release mechanism for quick disconnection in case of separation between said first and second carriages; wherein said connector is modular and contains within it a number of separate connector modules (12a-12d), each connector module being dedicated to a respective one of said cables (11a-11d), being independently shielded and individually sealed: a first connector module, with two contacts, to receive the first cable; a second connector module, with four contacts, to receive the second cable; a third connector module, with twelve contacts, to receive the third cable; and a fourth connector module to accommodate the fourth cable. a first cable with two conductors, wired in a respective dedicated shielded module; a second cable with four conductors, with controlled impedance, shielded and wired in its own dedicated module; a third cable with twelve conductors, shielded and wired in its own dedicated module; and a fourth cable, with four pairs of conductors of the AWG-23 cat-7a Ethernet data communication type; and in that said connector is designed for coupling to a panel connector fitted in the respective fixed panel element (8a, 8b) with a safety release mechanism for quick disconnection in case of separation between said first and second carriages; wherein said connector is modular and contains within it a number of separate connector modules (12a-12d), each connector module being dedicated to a respective one of said cables (11a-11d), being independently shielded and individually sealed: a first connector module, with two contacts, to receive the first cable; a second connector module, with four contacts, to receive the second cable; a third connector module, with twelve contacts, to receive the third cable; and a fourth connector module to accommodate the fourth cable. a first connector module, with two contacts, to receive the first cable; a second connector module, with four contacts, to receive the second cable; a third connector module, with twelve contacts, to receive the third cable; and a fourth connector module to accommodate the fourth cable.