| Compagnia ferroviaria |
Logo & collegamento |
S-Bahn Liechtenstein  |
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Sabah State Railway (SSR)  |
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Sächsische Dampfeisenbahngesellschaft mbH  |
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| Sächsisch-Oberlausitzer Eisenbahn |
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SAD Trasporto Locale SpA  |
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Sagami Railway (Sotetsu line)  |
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| Sagano Scenic Railway |
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Sakartvelos Rkinigza  |
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Salzburger Lokalbahn  |
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| Sangi Railway |
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| Sanriku Railway |
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| Sanyo Electric Railway |
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Saudi Arabia Railways (SAR)  |
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| Saudi Railways Organization (SRO) |
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| SBB Deutschland |
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SC Softrans SRL  |
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| SC Transferoviar Calatori |
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ScotRail  |
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| Seibu Railway |
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| Semboku Railway |
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| Sendai Airport Transit |
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| Serco Caledonian Sleepers Ltd |
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Serveis Ferroviaris de Mallorca  |
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| Shikoku Railway |
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| Shimabara Railway |
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| Shin-Keisei Electric Railway |
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| Shinano Railway |
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| Shintetsu |
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| Shizuoka Railway |
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| Shonan Monorail |
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Shongololo Express  |
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Shore Line East  |
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| Shosholoza Meyl |
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| Sistemi Territoriali SpA |
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Skånetrafiken Pågatågen  |
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Slovenske železnice  |
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| Società Ferrovie Udine-Cividale (FUC) |
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| Società Subalpina Imprese Ferroviarie |
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Société Commerciale des Transports et des Ports  |
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Société Nationale des Chemins de fer Belges (SNCB)  |
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| Société Nationale des Chemins de fer du Congo (SNCC) |
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Société Nationale des Chemins de fer Français (SNCF)  |
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Société nationale des chemins de fer luxembourgeois CFL)  |
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Société Nationale des Chemins de fer Tunisiens (SNCFT)  |
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Société nationale des Transports Ferroviaires (SNTF)  |
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Société Nationale Industrielle et Minière (SNIM)   |
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Sofse  |
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| Sonoma-Marin Area Rail Transit |
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| Sounder Train |
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South Caucasus Railway  |
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South Central Railway  |
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| South East Central Railway |
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| South Eastern Railway |
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| Southeastern |
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| Southeastern Pennsylvania Transportation Authority (SEPTA) |
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| South Florida Regional Transportation Authority (SFRTA) |
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| Southern |
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| South Hokkaido |
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| South West Trains |
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| South Western Railway |
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| South Western Railway |
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Srbija Voz   |
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Sri Lanka Railways  |
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St. Kitts Scenic Railway  |
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Standard Gauge Railway Uganda  |
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| Stansted Express |
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State Railway of Thailand  |
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| Statens Järnvägar (SJ) |
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| Stauden-Verkehrs-GmbH (SVG) |
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| Steiermarkbahn Transport und Logistik GmbH (STB) |
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| Stern & Hafferl Verkehrsgesellschaft mbH |
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| Süd-Thüringen Bahn GmbH (STB) |
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Sudan Railways Corporation (SRC)  |
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Südostbahn (SOB)  |
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| Südtirol Bahn |
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| Südwestdeutsche Verkehrs AG (SWEG) |
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| SunRail |
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Supreme Railways  |
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| Sursee-Triengen-Bahn AG |
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Sydney Trains  |
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Syrian Railways General Est. (CFS)  |
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| SZU Sihltal Zürich Uetliberg Bahn AG |
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Szybka Kolej Miejska (PKP Trójmieście)  |
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| Szybka Kolej Miejska w Warszawie |
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