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?

full_context: Document 1: Castles of Bellinzona: The Castles of Bellinzona are a group of fortifications located around the town of Bellinzona, the capital of the Swiss canton of Ticino. Situated on the Alpine foothills, the group is composed of fortified walls and three castles named Castelgrande, Montebello and Sasso Corbaro. Castelgrande is located on a rocky peak overlooking the valley, with a series of walls that protect the old city and connect to Montebello. Sasso Corbaro, the highest of the three castles, is located on an isolated rocky promontory south-east of the other two. The Castles of Bellinzona with their defensive walls have been an UNESCO World Heritage Site since 2000.
Document 2: Karlsruhe–Basel high-speed railway: The Karlsruhe–Basel high speed railway ("Ausbau- und Neubaustrecke Karlsruhe–Basel", literally "Upgraded and new line Karlsruhe–Basel") is a new line being built on the route of the Mannheim–Karlsruhe–Basel railway (Rhine Valley Railway). As a result of the project, the railway through the Rhine Valley is being upgraded to four continuous tracks and its operational efficiency will be increased as a result of the segregation of the various transport flows. The travel time for passenger services between Karlsruhe and Basel is to be shortened by 31 minutes. The project forms part of the Rotterdam–Genoa corridor and part of it is also part of the Main line for Europe ("Magistrale für Europa" in German and "Magistrale européenne" in French; Paris–Budapest). In September 2010, it was forecast to be completed in 2020.
Document 3: Schaffhausen: Schaffhausen (] ; Alemannic German: "Schafuuse" ; French: "Schaffhouse" ; Italian: "Sciaffusa" ; Romansh: "Schaffusa" ; English: Shaffhouse ) is a town with historic roots, a municipality in northern Switzerland, and the capital of the canton of the same name; it has an estimated population of 36,000 as of December 2016 . It is located right next to the shore of the High Rhine; it is one of four Swiss towns – besides Neuhausen a. Rhf., the historic Neunkirch and Stein a. Rh. – that is located on the northern side of the Rhine.
Document 4: Basel Badischer Bahnhof: Basel Badischer Bahnhof (literally "Basel Baden Railway station", the name referring to the Grand Duchy of Baden State Railways, which built the station) is a railway station situated in the Swiss city of Basel. The station is situated on Swiss soil, but the station is operated by the German railway company Deutsche Bahn. A customs border is situated in the passenger tunnel between the tracks and the station hall. It is the only railway station that is operated as part of the German national rail network yet not located within Germany's state boundaries, and it is listed as a Swiss heritage site of national significance. The station is served by the lines RE , RB , S 6 of the tri-national Regio S-Bahn Basel, and ICE and EC/IC lines to and from Freiburg, Karlsruhe, Mannheim, Frankfurt, Hamburg, Berlin and other cities in Germany.
Document 5: Altstätten: Altstätten is a small historic rural town and a municipality in the district Rhine Valley, in the canton of St. Gall in Switzerland. It is located with some secure distance of about 5 km west from the Alpine Rhine in the flat and wide St. Gall Rhine Valley, which also designates the border with Austria. It further gives access to the higher situated Appenzell to the west.
Document 6: Lausanne: Lausanne ( , ] , German: "Lausanne" , and also "Lausannen" Italian: "Losanna" , Romansh: "Losanna" ) is a city in the French-speaking part of Switzerland, and the capital and biggest city of the canton of Vaud. The city is situated on the shores of Lake Geneva (French: "Lac Léman" , or simply "Le Léman"). It faces the French town of Évian-les-Bains, with the Jura Mountains to its north-west. Lausanne is located 62 km northeast of Geneva.
Document 7: Rhaetian Railway: The Rhaetian Railway (German: "Rhätische Bahn" , Italian: "Ferrovia Retica" , Romansh: "Viafier Retica" ), abbreviated RhB, is a Swiss transport company that owns the largest network of all private railway operators in Switzerland. 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). Inaugurated in 1888 and expanded from 1896 onwards in various sections, the RhB network is located almost entirely within Graubünden, with one station across the Italian border at Tirano.
Document 8: Chur Wiesental (Rhaetian Railway station): Chur Wiesental is a railway station in the northern part of the town of Chur, the capital of the Swiss canton of Grisons. The station is on the Rhaetian Railway's single-track metre gauge line between Chur and Landquart, and has one side platform. The two-track SBB line runs parallel but has no intermediate stops between Chur and Landquart.
Document 9: Davos: Davos (German pronunciation ] , rarely ] ,; Romansh: "" , archaic Italian: "Tavate") is a Alpine town, and a municipality in the Prättigau/Davos Region in the canton of Graubünden, Switzerland. It has a permanent population of (2016 ). Davos is located on the river Landwasser, in the Rhaetian Alps, between the Plessur and Albula Range. At 1560 m , it is the highest "town" in Europe.
Document 10: Rätia (train): Rätia is a EuroCity train service that linked Hamburg in Germany with Chur in Switzerland via Dortmund, Cologne, Mannheim, Basel and Zurich, following the river Rhine for a significant part of its journey. The service is named after Rhaetia, the Roman province that the city of Chur was in. Over the years, the name "Rätia" has been given to a number EC services between Chur and various parts in Germany, although the current services - EC 6/7 - lost their name in 2004. Since 2015 the service's southern terminus was cut bach to Zurich.
Document 11: Reutlingen–Schelklingen railway: The Reutlingen–Schelklingen railway or Swabian Jura Railway (German: "Schwäbische Albbahn") is a 58.25 kilometre long branch line from Reutlingen to Schelklingen, which crosses the Swabian Jura in southern Germany. Its route no. is 4620. The section from Reutlingen to Honau is also known as the Echaz Railway ("Echazbahn") or Echaz Valley Railway ("Echaztalbahn"). The 15.28 kilometre long northern section from Reutlingen to Kleinengstingen is closed nowadays, this section has been largely converted into a rail trail.
Document 12: Sources of the Rhine: Lake Toma in the Swiss Canton of Graubünden is generally regarded as the source of the Rhine. Its outflow is called "Rein da Tuma" and after a few kilometers, it forms the "Vorderrhein" (English: "Anterior Rhine"; Romansh: "Rein Anteriur"). The course of this river is not particularly representative, after about two kilometers, its water is diverted into Curnera reservoir. The water is released at the Tavanase plant and flows into the Rhine at Ilanz. The river begins to be called "Rhine" in the vicinity of Chur, more specifically, at the confluence of the Vorderrhein and Hinterrhein (river) in Reichenau.
Document 13: Bernina Express: The Bernina Express is a train connecting Chur (or Davos) in Switzerland to Poschiavo in Switzerland and Tirano in Italy by crossing the Swiss Engadin Alps. For most of its journey, the train also runs along the World Heritage Site known as the Rhaetian Railway in the Albula / Bernina Landscapes.
Document 14: Bellinzona: Bellinzona (] ; French: "Bellinzone" ] , German: "Bellenz" ] , Romansh: "Blizuna" ] ) is the capital of the canton Ticino in Switzerland. The city is famous for its three castles (Castelgrande, Montebello, Sasso Corbaro) that have been UNESCO World Heritage Sites since 2000.
Document 15: Chur: Chur or Coire (] or ] ; Romansh: "Cuira" ] or ] ; Italian: "Coira" ] ; French: "Coire" ] ) is the capital and largest town of the Swiss canton of Grisons and lies in the Grisonian Rhine Valley, where the Rhine turns towards the north, in the northern part of the canton. The city, which is located on the right bank of the Rhine, is reputedly the oldest town of Switzerland.
ground_truth: Switzerland