| 101 | RTCX | Union Tank Car Co. | added 7/77; 1/80-7/2000 | | NRHS |
| 102 | RTCX | (UTCX) UNION TANK CAR CO [REPUBLIC TANK CAR CO.] | | | PWRC |
| 103 | RTCX | Republic Tank Car Co. (Union Tank Car) | | | RSRV |
| 104 | RTCX | REPUBLIC CAR LINE INC | | | SCAC3 |
| 105 | RTCX | UNION TANK CAR CO | | | SCAC4 |
| 106 | RTCX | Republic Tank Car Co. | | USA | TRAFFIC |
| 107 | RTCY | RICHARD TRANSPORT COMPANY INC | | | SCAC3 |
| 108 | RTCY | R TWO (R2) LOGISTICS INC | | | SCAC4 |
| 109 | RTCZ | Rocor Freight Services | | | RSRV |
| 110 | RTCZ | ROCOR FREIGHT SERVICES | | | SCAC4 |
| 111 | RTD | L-3 Communications Flight International Aviation, LLC | Callsign: Riptide, | USA | AVCODES |
| 112 | RTD | Regional Transportation District | City: Denver | USA | TRAFFIC |
| 113 | RTDA | ROOT, DALE S TRUCKING | | | SCAC3 |
| 114 | RTDA | RUEST, DANIEL | | | SCAC4 |
| 115 | RTDC | RAY'S TRANSPORT INC | | | SCAC4 |
| 116 | RTDE | RICARDOS | | | SCAC4 |
| 117 | RTDF | RUBENS TRUCKING COMPANY INC | | | SCAC4 |
| 118 | RTDI | RELIANCE TRADING CORP OF AMERICA | | | SCAC3 |
| 119 | RTDI | RUGOSA TRADING INC | | | SCAC4 |
| 120 | RTDK | REDLINE TRUCKING INC | | | SCAC4 |
| 121 | RTDL | RAUSCH, TED L CO | | | SCAC3 |
| 122 | RTDL | RAUSCH, TED L CO | | | SCAC4 |
| 123 | RTDN | RTD | | | SCAC4 |
| 124 | RTDO | RELIABLE TRUCKING INC | | | SCAC4 |
| 125 | RTDQ | ROSAS TRUCKING LLC | | | SCAC4 |
| 126 | RTDS | R & T DISPATCH INC | | | SCAC3 |
| 127 | RTDS | RT DE JUAREZ S DE RL MI | | | SCAC4 |
| 128 | RTDV | REBEL TRANSPORT (DIV OF 4186397 CAN | | | SCAC4 |
| 129 | RTDW | ROMANO TRUCKING INC | | | SCAC4 |
| 130 | RTDZ | REGIONAL TRANSPORTATION DISTRICT (DENVER) | | | PWRC |
| 131 | RTDZ | Regional Transportation District (Denver) | | | RSRV |
| 132 | RTE | Aero Transporte La Montana, C.A. | Callsign: La Montana, | YV | AVCODES |
| 133 | RTE | Aeronorte | | | ICAO1 |
| 134 | RTEC | RITE TRUCKING CO INC | | | SCAC3 |
| 135 | RTEC | Regia Transport Electric Chișinău | City: Chișinău | MD | TRAFFIC |
| 136 | RTEE | R T EIGHTY (80) EXPRESS INC | | | SCAC4 |
| 137 | RTEH | ROGERS, TERRENCE H INC | | | SCAC3 |
| 138 | RTEH | REEDEREI TSM EBERHARDT ARCTIC (GMBH | | | SCAC4 |
| 139 | RTEI | R T E TRANSPORTATION INC | | | SCAC3 |
| 140 | RTEI | ROSTECH TECHNOLOGIES | | | SCAC4 |
| 141 | RTEJ | RITTERBECK, EARL J | | | SCAC3 |
| 142 | RTEJO | Rodoviária do Tejo, S.A. | | P | TRAFFIC |
| 143 | RTEK | RITTER, KEN | | | SCAC3 |
| 144 | RTEK | REMATEK INC | | | SCAC4 |
| 145 | RTEL | RAPID CONTAINER SERVICE INC | | | SCAC4 |
| 146 | RTEN | ROUTE NETWORK | | | SCAC3 |
| 147 | RTEO | ROTE OIL LTD | | | SCAC4 |
| 148 | RTEP | ROGERS TRUCKS & EQUIPMENT INC | | | SCAC3 |
| 149 | RTEP | REEF TRUCKING ENTERPRISES LTD | | | SCAC4 |
| 150 | RTEQ | ROUTE 495 WAREHOUSE | | | SCAC3 |
| 151 | RTEQ | RUSH INTRASTATE TRANSPORTATION | | | SCAC4 |
| 152 | RTER | R T E TRANSPORT LTD | | | SCAC4 |
| 153 | RTET | RITE TRUCK LINES INC | | | SCAC3 |
| 154 | RTEV | REITER TRANSPORTATION SERVICES INC | | | SCAC4 |
| 155 | RTEW | RITE-WAY | | | SCAC3 |
| 156 | RTEW | ROADMASTERS POWER TRANSPORT LP | | | SCAC4 |
| 157 | RTEX | Rail Trusts Equipment Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 158 | RTEX | Reese Enterprises, Inc. | added 7/1974; 1/1975; eliminated 1/1979 | | NAKINA |
| 159 | RTEX | Reese Tank Car Leasing Corp. | added 10/1968; 4/1970; eliminated 7/1974 | | NAKINA |
| 160 | RTEX | Rosman Tanning Extract Co. | 7/1937-1/1946 | | NAKINA |
| 161 | RTEX | Rosman Tanning Extract Co. | Apr-38 | | NRHS |
| 162 | RTEX | Reese Tank Car Leasing Corp. | added 10/68; 4/70 | | NRHS |
| 163 | RTEX | Reese Enterprises, Inc. | 1/75; eliminated 1/79 | | NRHS |
| 164 | RTEX | Rail Trusts Equipment Inc. | Jul-00 | | NRHS |
| 165 | RTEX | *ROSMAN TANNING EXTRACT CO. | | | PWRC |
| 166 | RTEX | *REESE ENTERPRISES, INC. [REESE TANK CAR LEASING CORP.] | | | PWRC |
| 167 | RTEX | +RAIL TRUSTS EQUIPMENT INC. | | | PWRC |
| 168 | RTEX | Rail Trusts Equipment | | | RSRV |
| 169 | RTEX | Rail Trusts Equipment Inc. | | USA | TRAFFIC |
| 170 | RTEY | REIMER TRANSPORT INC | | | SCAC4 |
| 171 | RTF | Ruta | | E | AVCODES |
| 172 | RTFB | RELAINT TRANSPORTATION C F | | | SCAC4 |
| 173 | RTFC | RAPID TRANSFER COMPANY, THE | | | SCAC3 |
| 174 | RTFD | RTF INDUSTRIES INC | | | SCAC3 |
| 175 | RTFF | RUTHERFORD FARMS | | | SCAC4 |
| 176 | RTFI | ROLLING THUNDER FREIGHT LINES INC | | | SCAC3 |
| 177 | RTFI | ROMAN TOOL & FABRICATING INC | | | SCAC4 |
| 178 | RTFI | RAILL TRANSPORT FEROVIAR INTERNATIONAL SRL | | RO | VKM |
| 179 | RTFK | ROCKTENN | | | SCAC4 |
| 180 | RTFL | RICHMOND TRANSFER LTD | | | SCAC3 |
| 181 | RTFL | RASTELLI FOODS | | | SCAC4 |
| 182 | RTFM | ROYAL TURF FARMS TRUCKING | | | SCAC3 |
| 183 | RTFN | ROUND TOP FARM AND TRANSPORTATION L | | | SCAC4 |
| 184 | RTFQ | RIVERSIDE TRANSFER & STORAGE INC | | | SCAC3 |
| 185 | RTFR | RAINTREE FREIGHT SYSTEM | | | SCAC3 |
| 186 | RTFR | RAIL TRANSFER | | | SCAC4 |
| 187 | RTFT | RATLIFF TRUCKING INC | | | SCAC3 |
| 188 | RTFT | R T F TRANSPORTATION | | | SCAC4 |
| 189 | RTFU | AMURTRANSECO LTD | | | SCAC4 |
| 190 | RTFV | REL TRAFFIC SERVICES LIMITED | | | SCAC3 |
| 191 | RTFY | RELIABLE TRUCKING SERVICE INC | | | SCAC4 |
| 192 | RTG | Rely AS | Callsign: Reitan, | N | AVCODES |
| 193 | RTGA | ROSS TRUCKING | | | SCAC3 |
| 194 | RTGA | RT&T LOGISTICS INC | | | SCAC4 |
| 195 | RTGB | RELIABLE TRUCKING SERVICE INC | | | SCAC4 |
| 196 | RTGC | ROBERTS TRUCKING COMPANY | | | SCAC3 |
| 197 | RTGC | ROYANNS TRANSPORTATION GROUP NC | | | SCAC4 |
| 198 | RTGD | R TWO TRUCKING INC | | | SCAC4 |
| 199 | RTGG | RIBELIN TRUCKING INC | | | SCAC3 |
| 200 | RTGG | RUTTEN, T G TRUCKING INC | | | SCAC4 |
