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In the mid-1950s, SBB procured modern passenger coaches for international traffic from the Swiss wagon construction factory SWS in Schlieren.
2 car types, 1st class (initially declared as ½ class) and 2nd class were constructed using lightweight steel and were put into service between 1954 and 1957.
The first as ½.Kl. The declared wagons were structurally designed as 1st class wagons; already in view of the approaching class reform in 1956.
At the time of their commissioning, these wagons were among the most modern RIC wagons in Europe.
At that time they already had automatic ventilation, which provided fresh air in the warm season and created a pleasant travel climate with their warm air heating in the cold season. The system was designed for the electrical heating voltages and steam heating that were common in Europe at the time, although these were shut down or expanded at the end of the 1970s. The cars had incandescent lighting and some were equipped with loudspeakers. The heating, ventilation control and other technology were located in a small technology compartment between the 2nd and 3rd or 3rd and 4th compartments.
The wagons ran on bogies with wagon suspension by means of coil springs. They were equipped with the usual Oerlikon passenger train brakes, R brakes and, in some cases, additional regulating brakes.
All cars were equipped with bellows junctions. From around the beginning of the 1980s, the 1st class wagons were given rubber bulge transitions and, in some cases, modern lettering with the SBB arrow cross logo.
The cars were mainly used in high-quality passenger train service and came on international trains to Germany, Italy, France, the BeNeLux countries and Austria, among others. They were also transferable and suitable for ferry boats for Denmark and Sweden.
An interesting train route in the cross-border European route network were occasional deployments in the Simplon-Orient-Express Paris-Vallorbe-Lausanne-Brig-Milano-Trieste.
The 2nd class SBB Schlieren coaches were in use until the late 1980s; the 1st class car until the mid-1990s.
Most were then scrapped and demolished.
Some 1st and 2nd class cars were converted into HUPAC escort cars between 1988 and 1992 and were scrapped and scrapped around the beginning of the 2000s.
Unfortunately, no copy has survived for posterity.