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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.
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 then in
Electric heating voltages and steam heating, which are common in Europe, 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 in use until the late 1980s / early 1990s. Most were then scrapped and scrapped.
Some cars were converted into HUPAC escort cars between 1988 and 1992, and were scrapped and demolished around the beginning of the 2000s.
The first prototype car was put into service at the beginning of 1988 in SBB green with the new SBB and HUPAC logos.
The following cars were painted in a turquoise-like color that was attractive for the time.
These HUPAC escort cars were equipped with a WEBASTO auxiliary heater. An oil tank and various switching units were installed on the floor of the car. The folding bellows were removed from the car crossings and the frontal crossover doors were initially only closed; later removed and welded to a new insert plate that had a small window.
The interior was adapted in such a way that the bench remained on each side of the compartment and 3 flat beds were installed on the other side; similar to couchette cars.
The HUPAC trains on the rolling road were driven over the Gotthard at that time.
There were the relations (Freiburg iB -) Basel ? Lugano-Vedeggio and Singen / Rielasingen ? Lugano-Vedeggio.
The support cars ran directly behind the locomotive (main line Ae6 / 6 or Re6 / 6), followed by the low-floor wagons for the trucks.