| 2101 | RDEK | RED DUCK EXPRESS | | | SCAC4 |
| 2102 | RDEM | RED E TRUCKING INC | | | SCAC4 |
| 2103 | RDEN | ROBISON, DEAN | | | SCAC3 |
| 2104 | RDEO | RON-DEE TRUCKING CORP | | | SCAC3 |
| 2105 | RDEP | RND ENTERPRISES | | | SCAC4 |
| 2106 | RDEQ | RADIO EXPRESS SERVICE INC | | | SCAC3 |
| 2107 | RDER | RAIDER REFRIGERATED TRANSPORT INC | | | SCAC3 |
| 2108 | RDES | RONS DELIVERY SERVICE | | | SCAC3 |
| 2109 | RDET | ROGERS, DOYLE TRUCKING | | | SCAC3 |
| 2110 | RDEV | R D EXCAVATING INC | | | SCAC4 |
| 2111 | RDEW | RENDA ENTERPRISES CORP | | | SCAC4 |
| 2112 | RDF | Eurocopter Deutschland GmbH | Callsign: Red Fox, | D | AVCODES |
| 2113 | RDF | RDF | | FAN | TRAFFIC |
| 2114 | RDFA | RETAILERS DELIVERY FACILITY CO INC | | | SCAC3 |
| 2115 | RDFB | REISDORF BROS INC | | | SCAC4 |
| 2116 | RDFC | RENTCO DIV. FRUEHAUF CORP. | | | PWRC |
| 2117 | RDFC | RENTCO DIV. OF FRUEHAUF CORP. | | | SCAC3 |
| 2118 | RDFD | REEDSBURG FOOD CORPORATION | | | SCAC3 |
| 2119 | RDFD | RAINY DAY FLORAL DISTRIBUTION LLC | | | SCAC4 |
| 2120 | RDFE | ROADFREIGHT EXPRESS INC | | | SCAC3 |
| 2121 | RDFF | RANK DELIVERY SERVICE LLC | | | SCAC4 |
| 2122 | RDFG | R D F LOGISTICS INC | | | SCAC4 |
| 2123 | RDFI | RED D FREIGHT INC | | | SCAC4 |
| 2124 | RDFK | REED, FRANK | | | SCAC3 |
| 2125 | RDFL | REDA & SONS FUEL CO | | | SCAC4 |
| 2126 | RDFM | RODRIGUEZ, FRANCISCO M | | | SCAC3 |
| 2127 | RDFM | RED FRONT SUPER MARKET INC | | | SCAC4 |
| 2128 | RDFO | RED FOX | | | SCAC4 |
| 2129 | RDFP | REDI FRESH PRODUCE INC | | | SCAC4 |
| 2130 | RDFQ | REDFORD SHIPPING COMPANY | | | SCAC3 |
| 2131 | RDFR | ROADFORCE TRANSPORTATION | | | SCAC4 |
| 2132 | RDFS | ROADRUNNER FREIGHT SYSTEMS, INC | | | SCAC3 |
| 2133 | RDFS | ROADRUNNER TRANSPORTATION SERVICES | | | SCAC4 |
| 2134 | RDFT | REDFEARN TRUCKING, INC. | | | SCAC3 |
| 2135 | RDG | Norfolk Southern R.R. Co. (Norfolk Southern) | added 7/1999; 7/2000-7/2005 | | NAKINA |
| 2136 | RDG | Consolidated Rail Corp. | added 4/1976; 1/1980-1/1994; eliminated 7/1999 | | NAKINA |
| 2137 | RDG | Reading Co., Andrew L. Lewis, Jr. and Joseph L. Castle, Trustees | eliminated 4/1976 | | NAKINA |
| 2138 | RDG | Reading Co. | 7/1930-1/1975 | | NAKINA |
| 2139 | RDG | Reading Co. | 4/38-1/75 | | NRHS |
| 2140 | RDG | Reading Co., Andrew L. Lewis, Jr. and Joseph L. Castle, Trustees | eliminated 4/76 | | NRHS |
| 2141 | RDG | Consolidated Rail Corp. | added 4/76; 1/80-1/94; eliminated 7/99 | | NRHS |
| 2142 | RDG | Norfolk Southern R.R. Co. (Norfolk Southern) | added 7/99; 7/2000 | | NRHS |
| 2143 | RDG | NORFOLK SOUTHERN RAILROAD CO. [CONSOLIDATED RAIL CORP.; READING CO.] | | | PWRC |
| 2144 | RDG | Reading Railroad (Norfolk Southern) | | | RSRV |
| 2145 | RDG | Reading Company | | USA | TRAFFIC |
| 2146 | RDGA | RED DOG TRUCKING INC | | | SCAC4 |
| 2147 | RDGB | RED GOLD BOTTLING CORPORATION | | | SCAC4 |
| 2148 | RDGD | RIVINGTON, DOUGLAS G | | | SCAC4 |
| 2149 | RDGF | RED DOG EXPRESS LLC | | | SCAC4 |
| 2150 | RDGH | RATCHFORD, GEORGE H INC | | | SCAC3 |
| 2151 | RDGH | RATCHFORD, GEORGE H INC | | | SCAC4 |
| 2152 | RDGI | REDGO INC | | | SCAC4 |
| 2153 | RDGK | RODGERS TRUCKING CO | | | SCAC3 |
| 2154 | RDGL | RIDGELINE TRUCKING INC | | | SCAC3 |
| 2155 | RDGM | READING MOVING & STORAGE CO INC | | | SCAC3 |
| 2156 | RDGM | RODRIGUEZ MONSIVAIS, LUCIANO RODOLF | | | SCAC4 |
| 2157 | RDGN | REDS GARAGE INC | | | SCAC3 |
| 2158 | RDGO | REED, GEORGE, TRUCKING, INC | | | SCAC3 |
| 2159 | RDGO | REED, GEORGE TRUCKING COMPANY INC | | | SCAC4 |
| 2160 | RDGQ | RIDGECREST MOVING & STORAGE CO INC | | | SCAC3 |
| 2161 | RDGQ | RIDGECREST MOVING & STORAGE CO INC | | | SCAC4 |
| 2162 | RDGR | RODGERS BROTHERS EXPRESS, INCORPORA | | | SCAC3 |
| 2163 | RDGR | Regionalverkehrsdienst Gründau | Real: RDG, City: Gründau | D | TRAFFIC |
| 2164 | RDGS | RODGERS TRUCK SERVICE | | | SCAC3 |
| 2165 | RDGT | RODGERS TRUCKING | | | SCAC3 |
| 2166 | RDGT | RODGERS TRUCKING | | | SCAC4 |
| 2167 | RDHD | REIDHEAD ENTERPRISES | | | SCAC3 |
| 2168 | RDHD | REDHEAD EQUIPMENT LTD | | | SCAC4 |
| 2169 | RDHE | REDIEKS TRANSPORTATION COMPANY | | | SCAC3 |
| 2170 | RDHG | RIDING HIGH | | | SCAC3 |
| 2171 | RDHI | RED HILL TRANSPORTATION | | | SCAC3 |
| 2172 | RDHI | RED AND HOT TRANSPORTATION | | | SCAC4 |
| 2173 | RDHK | RED HAWK WELL SERVICING INC | | | SCAC4 |
| 2174 | RDHL | ROUND HILL FOODS INC | | | SCAC3 |
| 2175 | RDHN | ROBERTS, D H TRANSPORTATION | | | SCAC3 |
| 2176 | RDHN | RDH MINING EQUIPMENT | | | SCAC4 |
| 2177 | RDHO | ROADHOG LOGISTICS LLC | | | SCAC4 |
| 2178 | RDHP | REDS HORSE TRANSPORT | | | SCAC4 |
| 2179 | RDHQ | RDH TRUCKING INC | | | SCAC4 |
| 2180 | RDHS | RED BIRD HOT SHOT SERVICE | | | SCAC3 |
| 2181 | RDHT | ROMANGO, D H TRUCKING | | | SCAC3 |
| 2182 | RDHT | RED HORSE TRANSPORT INC | | | SCAC4 |
| 2183 | RDHU | ELECTRONIC MATERIALS | | D | BIC |
| 2184 | RDHU | RIEDEL DE HAEN AG | | | SCAC3 |
| 2185 | RDHU | HONEYWELL SPECIALITY CHEMICALS SEEL | | | SCAC4 |
| 2186 | RDHW | REEDEREI HERMANN WULFF | | | SCAC4 |
| 2187 | RDIB | REEDER DISTRIBUTORS INC | | | SCAC4 |
| 2188 | RDIC | RADSR INC | | | SCAC3 |
| 2189 | RDIC | RUDI EXPRESS INC | | | SCAC4 |
| 2190 | RDIE | RIDIES TRANSFER LLC | | | SCAC4 |
| 2191 | RDII | ROADSPRINT INC | | | SCAC3 |
| 2192 | RDIK | RODDICK TRANSPORT LIMITED | | | SCAC3 |
| 2193 | RDIL | RDI LOGISTICS INC | | | SCAC4 |
| 2194 | RDIN | RAPID DELIVERY OF INDIANA INC | | | SCAC3 |
| 2195 | RDIO | RADIO TRANSFER INC | | | SCAC3 |
| 2196 | RDIT | RODI TRUCKING SERVICE INC | | | SCAC3 |
| 2197 | RDIU | RAILDECKS INC | | | SCAC4 |
| 2198 | RDIX | Rapid Industrial Plastics Co. | added 1/1985; 1/1994-7/2005 | | NAKINA |
| 2199 | RDIX | Rapid Industrial Plastics Co. | added 1/85; 1/94-7/2000 | | NRHS |
| 2200 | RDIX | RAPID INDUSTRIAL PLASTICS COMPANY | | | PWRC |
