In 1930s, the Swiss Federal Railroad (SBB) decided to build the most unusual "flagship" - high-speed electric motor twin carriage. In 1938, two carriages of the SBB CLe 2/4 class (dubbed Roter Pfeil in German, i. e. "Red Arrow", also known as Fleche de Jura, i. e. "Jurassic Arrow") were rebuilt into two-unit RAe 4/8 train, christened Doppelpfeil(Double Arrow).
After WWII Winston Churchill used this train to make a short trip to the Lake Geneva (Lac Léman). Since then, the "Double Arrow" is known as Churchill-Pfeil. In 1953 two more Double Arrows were built for SBB, with "normalized" maximum speed of 125 km/h.