| Name | Country | Market Cap (US$) |
|---|
| SOCIETE D ENTREPRISE DE MOYENS ET DE MANUTENTIONS MARITIMES | Togo | Private |
| SOCIETE DE TRANSPORT MIXTE BANGRIN SARL | Burkina Faso | Private |
| Societe Nationale Des Chemins de Fer Belges | Belgium | Private |
| Societe Nationale des Chemins de Fer Francais | France | Private |
| SOCOBA SC | Spain | Private |
| Sogebail S.A. | France | Private |
| SOHOM SHIPPIHG SERVICES PRIVATE LIMITED | India | Private |
| Solil Management Company | United States | Private |
| SOLMAZ NAKLIYAT VE TICARET A S | Turkey | Private |
| Soo Line Railroad Company Inc | United States | Private |
| SOUTH EASTERN TRAINS LTD | United Kingdom | Private |
| South West Trains Ltd | United Kingdom | Private |
| SOUTHERN DOWNS STEAM RAILWAYS ASSOCIATION INC. | Australia | Private |
| Southern Pacific Rail Corporation | United States | Private |
| Southern Railway Of British Columbia Limited | Canada | Private |
| SPAIN TIR TRANSPORTES INTERNACIONALES SA | Spain | Private |
| SPDH - SERVIÇOS PORTUGUESES DE HANDLING, S.A. | Portugal | Private |
| Spedition Schachinger GmbH & Co. KG | Austria | Private |
| SPETSREMONT PRIVATE JOINT STOCK COMPANY | Russia | Private |
| Spoornet | South Africa | Private |
| Sprava a udrzba silnic Kralovehradeckeho kraje | Czech Republic | Private |
| Sprava a udrzba silnic Pardubickeho kraje | Czech Republic | Private |
| Sprava a udrzba silnic Usteckeho kraje, prispevkova organizace | Czech Republic | Private |
| Sprava silnic Moravskoslezskeho kraje, prispevkova organizace | Czech Republic | Private |
| Sprava silnic Olomouckeho kraje, prispevkova organizace | Czech Republic | Private |
| Sprava zeleznicni dopravni cesty, statni organizace | Czech Republic | Private |
| Springfield Terminal Railway Co Inc | United States | Private |
| STA TRANSPORT PTY LTD | Australia | Private |
| Stadler Altenrhein AG | Switzerland | Private |
| Stadler Bussnang AG | Switzerland | Private |
| Stadler Pankow GmbH | Germany | Private |
| STAGECOACH DEVON LTD | United Kingdom | Private |
| STAGECOACH TRANSPORT HOLDINGS PLC | United Kingdom | Private |
| Standard Car Truck Company Inc | United States | Private |
| Stanrail Corporation | United States | Private |
| State Railway Of Thailand | Thailand | Private |
| State Railway of Thailand, The | Thailand | Private |
| STAZIONI MARITTIME SPA | Italy | Private |
| Ste d'Admin et de Real d'Inv (SARI) | France | Private |
| Ste d'Etudes Financiere (SEFRI-CIME) | France | Private |
| Ste Financement Immeubles (FINABAIL) | France | Private |
| STE FRANCAISE CONST MATERIEL FERROVIAIRE | France | Private |
| Ste Immob Ges Elf Acquitane (SIGEA) | France | Private |
| Ste Immobiliere de Const (SICOFRAM) | France | Private |
| Ste Missions et Coord Immob (SMCI) | France | Private |
| Steego Corporation | United States | Private |
| STORY RAIL LTD | United Kingdom | Private |
| STRADEBLU SRL | Italy | Private |
| STRATEGIC RAIL AUTHORITY CO LTD | United Kingdom | Private |
| Süd Thüringen Bahn GmbH | Germany | Private |
| Sudler Management Company, L.L.C. | United States | Private |
| Südwest SWS Speditions- und Transport-GmbH & Co. KG | Germany | Private |
| Sulzer-Escher Wyss AG | Switzerland | Private |
| Sumai Co., Ltd. | Japan | Private |
| SUMIYOSHI, K.K. | Japan | Private |
| Sun Logistics Company Limited | Hong Kong | Private |
| Sun Logistics Group, Inc | United States | Private |
| Super Steel Schenectady Inc | United States | Private |
| Supertransport NV | Belgium | Private |
| Supply Management/Car | Canada | Private |
| Svenska Tågkompaniet AB | Sweden | Private |
| Swemaint AB | Sweden | Private |
| SWS Speditions-GmbH | Germany | Private |
| SZ CENTRALNE DELAVNICE LJUBLJANA D.O.O. | Slovenia | Private |
| T Myhrvold AS | Norway | Private |
| TA TU HUI PASSENGER TRANSPORT CO., LTD. | Taiwan | Private |
| Tågia AB | Sweden | Private |
| TAIPEI RAPID TRANSIT CO., LTD. | Taiwan | Private |
| Taiyo Home Co., Ltd. | Japan | Private |
| Taiyo Kanko Kaihatsu Co., Ltd. | Japan | Private |
| TAKAMATSU KOTOHIRA ELECTRIC RAILROAD CO.,LTD., THE | Japan | Private |
| Talgo Oy | Finland | Private |
| TANKPOL R MOSIO I WSPOLNICY SPOLKA JAWNA | Poland | Private |
| Taxipost NV | Belgium | Private |
| TCV STEVEDORING COMPANY S.A. | Spain | Private |
| TDN SA | Spain | Private |
| Tegernsee Bahn AG | Germany | Private |
| Teijin Shokusan K. K. | Japan | Private |
| Telfos Holdings plc | United Kingdom | Private |
| TENIXTOLL DEFENCE LOGISTICS PTY LTD | Australia | Private |
| TERMINAL RINFUSE ITALIA SPA | Italy | Private |
| Tetsudo Kaikan K. K. | Japan | Private |
| Texas Mexican Railway Company | United States | Private |
| TFM, S.A. de C.V. | Mexico | Private |
| TGOJ Trafik AB | Sweden | Private |
| Thalys International SCRL | Belgium | Private |
| Thames Trains Ltd | United Kingdom | Private |
| Thameslink Rail Ltd | United Kingdom | Private |
| The Arvida Corporation | United States | Private |
| The Asahi Building Co., Ltd. | Japan | Private |
| The Belt Railway Company of Chicago | United States | Private |
| The Bradford Companies | United States | Private |
| The Broe Companies, Inc. | United States | Private |
| The Cafaro Company | United States | Private |
| The Cedarwood Companies | United States | Private |
| The Charles E. Smith Companies | United States | Private |
| The Chiltern Railway Co Ltd | United Kingdom | Private |
| The Daiwa Real Estate Co., Ltd. | Japan | Private |
| THE INTEGRATED TRANSPORT COMPANY LTD | United Kingdom | Private |
| The Irvine Company | United States | Private |
|
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