The Z1 carriage family is largely based on the experience gained from building the Eurofima, of which FS purchased 100 units plus three prototypes between 1973 and 1978. The Z1 carriages were ordered and produced in four separate batches from 1985 to 2001, with slight differences between each series. in large quantities starting in 1985 for the new InterCity and EuroCity trains, thanks to their bogies approved for speeds of 200 km/h. These are vehicles for long-distance trains, intended for international and national traffic, specifically for fast trains and designed to complement the previous UIC-X and Gran Confort carriages.
The first-series carriages (type 1985) were purchased in several batches between 1985 and 1992 and consisted of: -545 second-class compartment carriages (divided into three successive batches of 160, 335, and 50 carriages) -70 first-class compartment carriages
Other variants of these carriages include: -80 second-class saloon carriages equipped with spaces for disabled passengers -40 luggage compartments. -35 first-series semi-conductor carriages, also saloon-style.
In 1989, the new 1st class units, intended primarily for EuroCity trains, were delivered with a new elegant two-tone grey livery with yellow stripes (nicknamed Finanziera), which was later extended to all other 2nd class compartment and saloon units, as well as to the luggage compartments
In 1992, a second order was placed for 100 compartment carriages (30 1st class and 70 2nd class), which were delivered between 1994 and 1996, all in two-tone grey livery.
