Question: Furka–Oberalp-Bahn Deh 4/4 I was operated in which southwestern Swiss canton?
Sentence (from "Furka–Oberalp-Bahn Deh 4/4 I"): The Furka Oberalp Bahn Deh 4/4 I, now known as the Matterhorn Gotthard Bahn Deh 4/4 51–55, is a five member class of metre gauge, rack rail, electric multiple units operated until 2002 by the Furka Oberalp Bahn (FO), and since then by its successor, the Matterhorn Gotthard Bahn (MGB), in the Canton of Valais, Switzerland.
Relevant evidence: Yes