Even before the first Pendolino EMU was built in Italy, in 1972, Fiat and RENFE signed an agreement for cooperation in tilting-train development. The first fruit of the cooperation was the equipment of a RENFE Class 432 EMU with the active tilting suspension in September 1972. After successful tests, Spanish trainmaker Construcciones y Auxiliar de Ferrocarriles and Fiat built a prototype similar to the ETR 401, which was delivered in 1976 as RENFE Class 443, nicknamed "Platanito" (Little banana) for its yellow livery. The four-car train had a commercial top speed of 180 km/h and achieved a then speed record for Spain of 206 km/h on 6 May 1987. However, the train remained a unique specimen, as RENFE favoured the entirely domestic Talgo Pendular, a tilting train with passive suspension introduced in 1980. After revenue service in 1979-1982, the train was used for charter and test runs.