Painting of body parts for the livery of the new Line 4. In all, 10 trains have been renovated.
The design of Line 4 reflects the Languedoc sun, star of fire and light (4th element of the system). Inspired by ancient engravings, the luminous colour of Line 4 consists of gold lamé, embroidered with pearls and sequins and embellished with gems and golden jewellery. On the lower sides of the flanks, such architectural designs as the Three Graces or the Pêyrou Water Tower represent the radiance of a town dominated by the equestrian statue of the Sun King.