What is "settebello"

The Settebello was a famous Italian high-speed express train that linked Milano Centrale in Milan with Roma Termini station in Rome, via Bologna and Florence. Introduced in 1953, it was operated by the Italian State Railways (FS) and used the distinctive ETR 300-type electric multiple unit trainsets, featuring observation lounges at the front and rear of the train. When introduced, it "set a standard of speed and luxurious travelling accommodation previously unknown in Italy [and] rivalling anything else on European rails." It was a Trans Europ Express (TEE) from 1974 until its withdrawal, in 1984.