| 8101 | RSYX | Refined Sugars, Inc. | added 7/81; eliminated 10/86; 1/94-7/2000 | NRHS | |
| 8102 | RSYX | REFINED SUGARS INC. | PWRC | ||
| 8103 | RSYX | Refined Sugars | RSRV | ||
| 8104 | RSYX | REFINED SUGARS INC. | SCAC4 | ||
| 8105 | RSZT | REED SPECIALIZED TRANSPORT INC | SCAC4 | ||
| 8106 | RT | ISG Cleveland Works Ry. Co. d/b/a Cleveland Works Ry. Co. | added 10/2002; 7/2005 | NAKINA | |
| 8107 | RT | The River Terminal Ry. Co. | 8/1920-7/2000; eliminated 10/2002 | NAKINA | |
| 8108 | RT | The River Terminal Ry. Co. | 4/38-7/2000 | NRHS | |
| 8109 | RT | *RIVER TERMINAL RAILWAY COMPANY | PWRC | ||
| 8110 | RT | +ISG CLEVELAND WORKS RWY. CO. d/b/a CLEVELAND WORKS RWY. CO. | PWRC | ||
| 8111 | RT | River Terminals Railway | RSRV | ||
| 8112 | RT | City: Reutlingen | D | TRAFFIC | |
| 8113 | RT | Rittgård Trading AB | SE | VKM | |
| 8114 | RTA | Regional Transportation Authority | 1/1980 | NAKINA | |
| 8115 | RTA | Regional Transportation Authority | Jan-80 | NRHS | |
| 8116 | RTA | REGIONAL TRANSPORTATION AUTHORITY (NOT AN OPERATING RAILROAD) | PWRC | ||
| 8117 | RTA | Regional Transportation Authority, Chicago | USA | TRAFFIC | |
| 8118 | RTAB | R & K TRUCKING | SCAC4 | ||
| 8119 | RTAC | ROWE | SCAC4 | ||
| 8120 | RTACA | Riverside Transit Agency | Real: RTA, City: Riverside | US- | TRAFFIC |
| 8121 | RTAD | RITE AID TRANSPORT INC | SCAC4 | ||
| 8122 | RTAE | RILO TRUCKING LLC | SCAC4 | ||
| 8123 | RTAF | Régie des transports de l'Aisne | F | TRAFFIC | |
| 8124 | RTAG | RISTVEBT TRUCKING & GRAIN SERVICE | SCAC3 | ||
| 8125 | RTAG | RISTVEDT TRUCKING AND GRAIN SERVICE | SCAC4 | ||
| 8126 | RTAH | RTA INTERNATIONAL INC | SCAC3 | ||
| 8127 | RTAJ | RARA TRANSPORT | SCAC4 | ||
| 8128 | RTAK | ROACH TRUCKING | SCAC4 | ||
| 8129 | RTAL | ROSEDALE TRANSPORT LTD | SCAC3 | ||
| 8130 | RTAL | ROSEDALE TRANSPORT LTD | SCAC4 | ||
| 8131 | RTAM | RICHARDS TRUCKING AND MESSENGER SER | SCAC3 | ||
| 8132 | RTAN | ROBBINS TRANSPORT INC | SCAC3 | ||
| 8133 | RTAO | ROSE TRANSPORTATION INC | SCAC3 | ||
| 8134 | RTAO | ROBERTS, T A OIL CO INC | SCAC4 | ||
| 8135 | RTAP | RAYS TRANSPORTATION INC | SCAC3 | ||
| 8136 | RTAP | RAM TRANSPORT INC | SCAC4 | ||
| 8137 | RTAR | ROTARY TECHNOLOGY INC | SCAC3 | ||
| 8138 | RTAS | RUGGED TRANSPORT | SCAC4 | ||
| 8139 | RTAT | REGIONAL TRANSIT AUTHORITY/ART INC, | SCAC3 | ||
| 8140 | RTAW | ROSEWOODS TRANSPORTATION INC | SCAC4 | ||
| 8141 | RTAX | RENFE TALGO OF AMERICA, INC. | PWRC | ||
| 8142 | RTAX | RIO TINTO ALCAN | SCAC4 | ||
| 8143 | RTAY | RITEWAY TRANSPORTS LLC | SCAC4 | ||
| 8144 | RTB | Rurtalbahn GmbH | Düren | D | privat-bahn.de |
| 8145 | RTB | Rurtalbahn | former Dürener Kreisbahn | D | TRAFFIC |
| 8146 | RTB | Rurtalbahn | DE | VKM | |
| 8147 | RTBA | REMAL TRANSPORT LTD | SCAC4 | ||
| 8148 | RTBB | RENAISSANCE TRANSPORT LTD | SCAC4 | ||
| 8149 | RTBBG | Railway Tehnik Blgaria | BG | VKM | |
| 8150 | RTBC | RETUBECO INC | SCAC4 | ||
| 8151 | RTBC | RTB Cargo | D | TRAFFIC | |
| 8152 | RTBC | Rurtalbahn Cargo GmbH | DE | VKM | |
| 8153 | RTBD | RMA TRANSPORTATION SERVICES INC (IN | SCAC4 | ||
| 8154 | RTBE | ROTOBEC INC | SCAC4 | ||
| 8155 | RTBF | REESE TRANSPORT INC | SCAC4 | ||
| 8156 | RTBI | RUBENS TRUCK BROKERAGE INC | SCAC4 | ||
| 8157 | RTBO | ROCCOS | SCAC4 | ||
| 8158 | RTBORN | Rail Terminal Born | NL | TRAFFIC | |
| 8159 | RTBQ | REBA TRANSPORT LLC | SCAC4 | ||
| 8160 | RTBR | R & T BURNS INC | SCAC3 | ||
| 8161 | RTBT | ROOT, BOB TRUCKING INC | SCAC3 | ||
| 8162 | RTBV | RUPLINGER TRUCKING, LLC | SCAC4 | ||
| 8163 | RTC | Rail Traction Company | I | TRAFFIC | |
| 8164 | RTC | Rail Traction Company | IT | VKM | |
| 8165 | RTCA | RANDOLPH TRUCKING COMPANY INC | SCAC3 | ||
| 8166 | RTCA | ROOT CELLAR ANTIQUES | SCAC4 | ||
| 8167 | RTCC | RINEHOLD TRUCKING COMPANY INC | SCAC4 | ||
| 8168 | RTCD | RIGHT TRANSPORTATION CO | SCAC4 | ||
| 8169 | RTCF | RTCT TRANSPORT LTD | SCAC4 | ||
| 8170 | RTCH | RED & TAN CHARTER INC | SCAC3 | ||
| 8171 | RTCH | REGULATORY SOLUTIONS INC | SCAC4 | ||
| 8172 | RTCJ | RENES TRUCKING INC | SCAC4 | ||
| 8173 | RTCK | ROBIN TRUCK LINE INC | SCAC3 | ||
| 8174 | RTCL | RTC LTD | SCAC3 | ||
| 8175 | RTCM | RUSSELL TRANSPORT CORP | SCAC4 | ||
| 8176 | RTCN | RIVERVIEW TOURS CORPORATION | SCAC3 | ||
| 8177 | RTCN | R E TRUCKING | SCAC4 | ||
| 8178 | RTCO | RELIABLE TRANSFER CO | SCAC3 | ||
| 8179 | RTCP | R A C TRANSPORT COMPANY INC | SCAC3 | ||
| 8180 | RTCP | RATT INC | SCAC4 | ||
| 8181 | RTCQ | ROBERTS TRUCKING CO | SCAC3 | ||
| 8182 | RTCQ | Reseau de transport de la Capitale | Real: RTC, City: Quebec | CDN | TRAFFIC |
| 8183 | RTCR | RTC TRANSPORTATION INC (A DIV OF RO | SCAC3 | ||
| 8184 | RTCR | ROTEC INDUSTRIES INC | SCAC4 | ||
| 8185 | RTCSN | Regional Transportation Commission of Southern Nevada | City: Las Vegas | USA | TRAFFIC |
| 8186 | RTCT | RAINBOW TRUCKING CO AND CHEMICAL TR | SCAC3 | ||
| 8187 | RTCT | RTC LOGISTICS INC | SCAC4 | ||
| 8188 | RTCU | OY RAILTRANS LTD | SCAC4 | ||
| 8189 | RTCX | Union Tank Car Co. | added 7/1977; 1/1980-7/2005 | NAKINA | |
| 8190 | RTCX | Republic Car Line Inc. | added 7/1964; 7/1965-1/1975; eliminated 7/1977 | NAKINA | |
| 8191 | RTCX | Republic Tank Car Co. | 1/1943-4/1961; eliminated 7/1964 | NAKINA | |
| 8192 | RTCX | Republic Tank Car Co. | 1/52-4/61; eliminated 7/64 | NRHS | |
| 8193 | RTCX | Republic Car Line Inc. | added 7/64; 7/65-1/75; eliminated 7/77 | NRHS | |
| 8194 | RTCX | Union Tank Car Co. | added 7/77; 1/80-7/2000 | NRHS | |
| 8195 | RTCX | (UTCX) UNION TANK CAR CO [REPUBLIC TANK CAR CO.] | PWRC | ||
| 8196 | RTCX | Republic Tank Car Co. (Union Tank Car) | RSRV | ||
| 8197 | RTCX | REPUBLIC CAR LINE INC | SCAC3 | ||
| 8198 | RTCX | UNION TANK CAR CO | SCAC4 | ||
| 8199 | RTCX | Republic Tank Car Co. | USA | TRAFFIC | |
| 8200 | RTCY | RICHARD TRANSPORT COMPANY INC | SCAC3 |