| 1 | RS | Roberval and Saguenay Ry. Co. | 10/1966 & 1/1975-7/2005; eliminated 1/2008 | NAKINA | |
| 2 | RS | Roberval-Saguenay Ry. | 1/1941-4/1970 | NAKINA | |
| 3 | RS | Roberval and Saguenay Ry. Co. | 4/1938 | NAKINA | |
| 4 | RS | Roberval and Saguenay Ry. Co. | Apr-38 | NRHS | |
| 5 | RS | Roberval-Saguenay Ry. | 1/52-4/70 | NRHS | |
| 6 | RS | Roberval and Saguenay Ry. Co. | 10/66 & 1/75-7/2000 | NRHS | |
| 7 | RS | ROBERVAL & SAGUENAY RAILWAY COMPANY | PWRC | ||
| 8 | RS | Roberval and Saguenay Railway | RSRV | ||
| 9 | RS | Roberval and Saguenay Ry. Co. | USA | TRAFFIC | |
| 10 | RS | RS Railspeed SA | CH | VKM | |
| 11 | RS&P | Roscoe, Snyder & Pacific Ry. | 7/1923-4/1938 | NAKINA | |
| 12 | RS&P | Roscoe, Snyder & Pacific Ry. | Apr-38 | NRHS | |
| 13 | RS&P | ROSCOE, SNYDER & PACIFIC RWY. | PWRC | ||
| 14 | RSA | Elisra Airlines | ICAO1 | ||
| 15 | RSA | REPUBLIC STEEL CO.(ALABAMA) | PWRC | ||
| 16 | RSA | Boliden Mineral AB | SE | VKM | |
| 17 | RSAA | RHINO SPECIALIZED TRANSPORT LLC | SCAC4 | ||
| 18 | RSAC | RAMSAY SCARLETT & CO INC | SCAC3 | ||
| 19 | RSAC | R S TRANSPORT | SCAC4 | ||
| 20 | RSAE | RSA EXPRESS INC | SCAC3 | ||
| 21 | RSAE | RELIANT TRUCK LINES | SCAC4 | ||
| 22 | RSAG | ROSE AGRI-SEED INC | SCAC4 | ||
| 23 | RSAG | City: Rostock | D | TRAFFIC | |
| 24 | RSAH | RSA LOGISTICS LLC | SCAC4 | ||
| 25 | RSAI | RESAL INC | SCAC3 | ||
| 26 | RSAM | ROSS, A M ENTERPRISES LTD | SCAC4 | ||
| 27 | RSAO | RAMOS ACOSTA, AYDE | SCAC4 | ||
| 28 | RSAQ | RUBBER SHIPPERS ASSOCIATION INC | SCAC3 | ||
| 29 | RSAR | R S AIR SERVICES | SCAC4 | ||
| 30 | RSAS | ROSAS TRANSPORTADORA S A DE C V | SCAC4 | ||
| 31 | RSAT | R & S AUTO TRANSPORT | SCAC3 | ||
| 32 | RSAT | REYES SANTOS, ARTEMIO | SCAC4 | ||
| 33 | RSAY | ROUSELL-AYR-FARM | SCAC4 | ||
| 34 | RSB | Rubystar | ICAO1 | ||
| 35 | RSB | Rochester Subway | 1/1980-7/2005 | NAKINA | |
| 36 | RSB | Rochester Subway | 1/80-7/2000 | NRHS | |
| 37 | RSB | Rail Service Bremen GmbH | Bremen | D | privat-bahn.de |
| 38 | RSB | ROCHESTER SUBWAY | PWRC | ||
| 39 | RSB | Rochester Subway | RSRV | ||
| 40 | RSBA | ROAD SCHOLAR TRANSPORTATION LLC | SCAC4 | ||
| 41 | RSBC | RUSTMAN BUS COMPANY | SCAC3 | ||
| 42 | RSBC | ROSENBALM & SONS INC | SCAC4 | ||
| 43 | RSBG | ROSBOROUGH BOATS | SCAC4 | ||
| 44 | RSBG | Rennsteigbahn | DE | VKM | |
| 45 | RSBH | R S TRUCKING | SCAC4 | ||
| 46 | RSBI | RSB LOGISTIC INC | SCAC4 | ||
| 47 | RSBJ | ROXANA SPECIALIZED HAULERS INC | SCAC4 | ||
| 48 | RSBL | RONNIE S STANDARD BRED LTD | SCAC3 | ||
| 49 | RSBL | RSB Logistic | D | TRAFFIC | |
| 50 | RSBM | ROYAL SEED TRANSPORT | SCAC4 | ||
| 51 | RSBO | ROSSITER BOATS | SCAC4 | ||
| 52 | RSBP | ROSS, B T TRANSPORT | SCAC3 | ||
| 53 | RSBQ | ROYAL SILK ARTS | SCAC4 | ||
| 54 | RSBS | ROSEBURG TRANSFER & STORAGE INC | SCAC3 | ||
| 55 | RSBS | RSB FREIGHT SOLUTIONS LLC | SCAC4 | ||
| 56 | RSBT | R S B TRUCK RENTAL | SCAC3 | ||
| 57 | RSBV | R & S BULK SERVICE | SCAC4 | ||
| 58 | RSBY | RESPASS BEAUTY SUPPLY CO INC | SCAC3 | ||
| 59 | RSBY | RODGERS, BRIAN | SCAC4 | ||
| 60 | RSC | Aerolineas Ejecutivas Tarascas | ICAO1 | ||
| 61 | RSC | DB Schenker Rail Scandinavia A/S | 2009 - | DK | jernbanen.dk |
| 62 | RSC | DB Schenker Rail Scandinavia A/S | 2009 - | DK | TRAFFIC |
| 63 | RSC | DB Schenker Rail Scandinavia A/S | DK | VKM | |
| 64 | RSCA | ROAD SCHOLAR TRANSPORT, INC | SCAC3 | ||
| 65 | RSCA | ROAD SCHOLAR TRANSPORT INC | SCAC4 | ||
| 66 | RSCB | R STREET-CITY TRANSPORT LTD | SCAC4 | ||
| 67 | RSCG | R & S CARTAGE INC | SCAC3 | ||
| 68 | RSCH | ROSS CHARTERS INC, A NORTH CAROLINA | SCAC3 | ||
| 69 | RSCI | ROSECO INC | SCAC4 | ||
| 70 | RSCJ | RICHMOND STEEL CANADA LIMITED | SCAC4 | ||
| 71 | RSCK | R & S TRUCKING | SCAC3 | ||
| 72 | RSCK | RUSH CREEK TRUCKING LLC | SCAC4 | ||
| 73 | RSCL | ROTARY SHIPPING CO LIMITED | SCAC3 | ||
| 74 | RSCM | REPORT SHIPPING COMPANY LTD. | SCAC3 | ||
| 75 | RSCN | RSC TRANSPORTATION INC | SCAC4 | ||
| 76 | RSCO | RONS SERVICE CO | SCAC3 | ||
| 77 | RSCO | Rolling Stock Company | RO | TRAFFIC | |
| 78 | RSCO | ROLLING STOCK COMPANY S.A. | RO | VKM | |
| 79 | RSCQ | REIS CARTAGE CO | SCAC3 | ||
| 80 | RSCR | RUSCO TRUCKING | SCAC3 | ||
| 81 | RSCR | R S CARRIER INC | SCAC4 | ||
| 82 | RSCS | R & S COURIERS INC | SCAC3 | ||
| 83 | RSCT | RSC LOGISTICS LLC | SCAC4 | ||
| 84 | RSCU | RAMSEY SCARLETT & CO INC | SCAC3 | ||
| 85 | RSCU | RED SEA NAVIGATION CO | SCAC4 | ||
| 86 | RSCV | ROMAR STONE CARVING | SCAC4 | ||
| 87 | RSCX | Republic Steel Corp. | 7/1935-4/1970; eliminated 1/1972 | NAKINA | |
| 88 | RSCX | The Ralston Steel Car Co. | 7/1923 | NAKINA | |
| 89 | RSCX | Republic Steel Corp. | 4/38-4/70; eliminated 1/72 | NRHS | |
| 90 | RSCX | *RALSTON STEEL CAR CO. | PWRC | ||
| 91 | RSCX | *REPUBLIC STEEL CO. | PWRC | ||
| 92 | RSCX | *RESCAR | PWRC | ||
| 93 | RSCX | REPUBLIC STEEL CORP | SCAC3 | ||
| 94 | RSCX | Republic Steel Corporation | USA | TRAFFIC | |
| 95 | RSCY | ROSE CITY TRANSPORTATION INC | SCAC4 | ||
| 96 | RSCZ | *(CSXT) RETIRED 04-06-93 ATP (ACI 2389) | PWRC | ||
| 97 | RSCZ | *RYERSON STEEL CO. | PWRC | ||
| 98 | RSD | RSD-Sicherheitsdienst GmbH& Co. | DE | VKM | |
| 99 | RSDB | RSD CONTRACTING LTD | SCAC4 | ||
| 100 | RSDC | ROSSI, D CONSTRUCTION CO INC | SCAC3 |