A wiring system is described in particular for the electrical connection between a first and a second carriage of a railway vehicle; the wiring system has at least one mobile wiring having a first and a second end connected to a respective connector designed for coupling to fixed panel elements carried by facing outside walls of the first and respectively, second carriages. The mobile wiring has a single sheath enclosing a number of cables separate and distinct, each designed for a different application, jointly designed to provide complete connectivity in terms of data and control signals between the carriages. The wiring system also provides for a first and a second fixed wiring, each arranged at a respective carriage, and designed to interface electrically with a respective end of the mobile wiring for the corresponding electrical connection to on-board equipment.