The interior was divided into two third-class sections, smoking and non-smoking. Both were furnished with wooden benches divided into rows of two and three seats, providing a total of 10 seats per module. There were 92 seats overall. Large, simple windows with metal frames. Round brass ventilators between the windows. Battery-powered electric lighting, and wooden slat luggage shelves above the seats, later replaced with luggage racks running lengthwise above the windows. The toilet was accessed from a platform at the end. These platforms were now the enclosed type with hinged access doors. Heating via steam radiators positioned under the seats as on the Az coaches. In 1955, they were included in electric train compositions and were therefore fitted with cables and pipes as well as high-voltage overhead lines on the roof. They were also equipped with electric heating.
They continued to operate until the early 1990s. Three of these coaches are in use by the SAFRE in Reggio Emilia. A fourth by a plant nursery in Saronno. A fifth is at the locomotive depot in Novate.