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From the mid-1950s, SBB purchased modern passenger coaches for international traffic from the Swiss wagon construction factory SWS in Schlieren.
3 car types, 1st class (initially declared as ½ class), 2nd class and couchette cars were constructed using lightweight steel construction and were put into service in several lots between 1954 and 1961; the couchette cars 1960 - 1961.
Even at that time, the couchette coaches 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, but these were shut down or expanded around 1980.
The cars had incandescent lighting and were equipped with loudspeakers.
Heating, ventilation control and other technology were in a small technology compartment between the 3rd and 4th compartment.
The compartments could be used in a sitting position during the day; couches could be folded out for the night.
In addition, there was a ladder in each compartment to reach the upper bunk beds.
The wagons ran on bogies with wagon suspension by means of coil springs.
They were equipped with the usual Oerlikon passenger train brakes and R brakes.
Even at that time, couchette cars had modern rubber bead transitions; at that time the first SBB wagons with rubber bead transitions.
These SBB couchette cars were used in high-quality passenger / night train services until the early 1990s.
They came on international trains to Germany, Italy, France, the BeNeLux countries and Austria, among others.
In Germany, the route led, among other things, via the Rhine route to Cologne / Dortmund and via Frankfurt, Hanover to Hamburg.
There were also trains running over the Gäubahn to Stuttgart and beyond.
There were trains to Amsterdam in the Netherlands and to Ostend in Belgium.
In Italy connections led to Rome, Ancona and the Riviera, among others.
When deployed in France, the cars came to Paris, Calais and Boulogne, among others.
In Austria the route led via Arlberg to Vienna.
The SBB Schlieren couchette cars were used internationally until the mid-1990s.
Then they were used for special military trains of the Swiss Army.
The last copies were discarded and broken off by around 2003.