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?

Context paragraphs:
Forst (Lausitz): Forst (Lausitz) (Lower Sorbian: "Baršć" ) is a town in Brandenburg, Germany.  It lies east of Cottbus, on the river Lausitzer Neiße which is also the German-Polish border, the Oder-Neisse line.  It is the capital of the Spree-Neiße district.  It is known for its rose garden and textile museum.  The town's population is 20,618.  In Forst, there is a railway bridge across the Neiße belonging to the line Cottbus–Żary which is serviced by regional trains and a EuroCity train between Hamburg and Kraków (2011).  There is also a road bridge across the river north of Forst.

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.

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.

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.

Polonia (train): The Polonia is a EuroCity (EC) express train.  It was introduced in 1997, to supplement the existing EuroCity train, the "Sobieski", on the international route between Vienna, the capital of Austria, and Warsaw, the capital of Poland, via the Czech Republic.

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.

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.

Swabian War: The Swabian War of 1499 ("Schwabenkrieg", also called "Schweizerkrieg" ("Swiss War") in Germany and "Engadiner Krieg" ["War of the Engadin"] in Austria) was the last major armed conflict between the Old Swiss Confederacy and the House of Habsburg.  What had begun as a local conflict over the control of the Val Müstair and the Umbrail Pass in the Grisons soon got out of hand when both parties called upon their allies for help; the Habsburgs demanding the support of the Swabian League, and the Federation of the Three Leagues of the Grisons turning to the Swiss "Eidgenossenschaft".  Hostilities quickly spread from the Grisons through the Rhine valley to Lake Constance and even to the Sundgau in southern Alsace, the westernmost part of Habsburg Further Austria.

Vindobona (train): The Vindobona was an international named passenger train which began service in 1957 between Berlin and Vienna via Dresden and Prague.  In later years the route was extended to run from Hamburg via Berlin, Dresden, Prague, Brno and Vienna to Villach.  It was named after the ancient settlement of Vindobona on the site of the modern city of Vienna.  Labelled as a EuroCity train connection from 1993, services discontinued in 2014.

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.

Supporting paragraphs: Rätia (train) Chur
Answer: Switzerland