Hello CuriousTraveller
Gemini could help you for the train categories:
Long-Distance Services (Fernverkehr)
These trains connect the major cities and regions of Switzerland.
IC (InterCity): These are the flagship long-distance trains connecting major urban centers like Zurich, Geneva, Bern, Basel, and Lucerne. They make very few stops, are the fastest domestic trains, and often feature a restaurant car or bistro and a family coach. Many IC services use modern double-decker rolling stock.
IR (InterRegio): These trains connect the main urban centers with regional centers. They are faster than regional trains but make more stops than InterCity trains. They are the workhorses of the Swiss long-distance network.
International Services
These trains connect Switzerland with neighboring countries.
EC (EuroCity): International trains that meet certain quality standards, connecting Swiss cities with cities in Germany, Italy, Austria, and more. They are similar in service level to Swiss InterCity trains.
ICE (Intercity-Express): Germany’s high-speed trains that operate on several routes into Switzerland, connecting cities like Basel, Zurich, and Interlaken with the German network.
TGV Lyria: France’s high-speed trains, operated as a joint venture with SBB, connecting Paris and other French cities with Geneva, Lausanne, Basel, and Zurich.
RJX (Railjet Xpress): Austria’s high-speed trains connecting Zurich with cities like Innsbruck, Salzburg, and Vienna.
Regional Services (Regionalverkehr)
These trains provide fine-grained service within a specific region.
RE (RegioExpress): Faster regional trains that connect regional centers. They do not stop at all stations on a route, allowing for quicker travel within a region compared to local trains.
R (Regio): Local trains that typically stop at all (or almost all) stations on a given route. They form the backbone of local public transport outside of major urban areas.
Suburban Services (S-Bahn)
These are commuter rail networks in major metropolitan areas.
S (S-Bahn): These trains provide high-frequency service in and around major cities like Zurich (the largest network), Geneva (Léman Express), Bern, Basel, and Lucerne. They are identified by an “S” followed by a line number (e.g., S1, S8, S16).
Kind regards
Danhiel