Question: Rätia is a EuroCity train service that linked Hamburg in Germany with Chur, is the capital and largest town of the Swiss canton of Grisons and lies in the Grisonian Rhine Valley, and are in which country?
Sentence (from "Rhaetian Railway"): The RhB operates all the railway lines of the Swiss Canton of Graubünden/Grisons, except for the line from Sargans to the cantonal capital, Chur, which are operated by the Swiss Federal Railways (SBB CFF FFS), and the line from Disentis/Mustér to the Oberalp Pass, and further on to Andermatt, Uri, which is operated by Matterhorn Gotthard Bahn (MGB).
Relevant evidence: No