What about other SBB EC trains?
Rembrandt and Berner Oberland, as far as I know, still have
DB WRmh 132 (or meanwhile WRmz 133?) serviced by Mitropa Suisse
(how is it now, did DBReise&Touristik take over?)
Transalpin has a WR IV "Catering" serviced by Passaggio.
Some WR IV "Prototypes" were rebuilt for Le Buffet Suisse and
used in trains to Germany, I don't know where they are operating
now. I think that the ECs to Italy have no international dining
car (it only goes to Chiasso).
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The Zürich to München EC as well as the Zürich to Hamburg EC both still have a dining car. The Zürich to Stuttgart unfortunately no longer does.