In the overhead vehicle system, the first rail and the second rail are disposed in a grid. The first rail (or second rail) is disposed such that a gap through which the connecting part below the traveling wheel is able to pass is formed between the rail and an intersection rail disposed at an intersection in the grid. The first rail (or the second rail) includes an auxiliary member configured to be removably attached to the attachment portion provided at the end in the longitudinal direction, the auxiliary member protruding from the rail upper surface of the rail and coming into contact with the auxiliary wheel.

A conveyor is described including one or more conveyor tracks individually provided with at least one guide rail extending along a predetermined path, and a plurality of carriages which can be coupled to said guide rail and adapted to run in succession along the path defined by it, wherein an electric motor is installed on each carriage, adapted to drive the running of said carriage along the guide rail independently with respect to the running of the other carriages, and a wireless communication module, adapted to wirelessly connect the electric motor to a remote electronic control unit configured to control the operation of the electric motor.