The RABe 514 is a four-car double decker electrical multiple unit used by the Swiss Federal Railways SBB-CFF-FFS for the Zürich S-Bahn. It is part of the Siemens Desiro Double Deck product family. The trains are also referred to as DTZ which stands for the German word Doppelstocktriebzug (English: double decker multiple unit).
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