| 4201 | HSVI | HTT SERVICE INC | SCAC4 | ||
| 4202 | HSVK | HENDERSCHIE | SCAC4 | ||
| 4203 | HSVL | HARRIS, V L TRUCKING | SCAC4 | ||
| 4204 | HSVN | HOOPER, STEVEN | SCAC4 | ||
| 4205 | HSVT | HUNTER, STEVE, TRUCKING | SCAC1 | ||
| 4206 | HSVT | HILL, STEVEN TRUCKING | SCAC4 | ||
| 4207 | HSW | Helena Southwestern R.R. Co. | 1/1975; eliminated 10/1976; added 7/1979; 1/1980; eliminated 1/1989; eliminated 4/1989 | NAKINA | |
| 4208 | HSW | Helena Southwestern R.R. Co. | 1/75; added 7/79; 1/80; eliminated 1/89; eliminated 4/89 | NRHS | |
| 4209 | HSW | Historischer Schienenverkehr Wesel e.V. | Wesel | D | privat-bahn.de |
| 4210 | HSW | HELENA SOUTHWESTERN RAILROAD | PWRC | ||
| 4211 | HSW | Helena Southwestern Railroad | RSRV | ||
| 4212 | HSW | Historischer Schienenverkehr Wesel e.V. | DE | VKM | |
| 4213 | HSWK | HORNSCREW TRUCKING | SCAC4 | ||
| 4214 | HSWS | HIGH SIERRA TRANSPORTATION LLC | SCAC4 | ||
| 4215 | HSWX | Min-Ad, Inc. | 4/1970; added 7/1970; eliminated 10/1970 | NAKINA | |
| 4216 | HSWX | Hercules Petroleum Co. | 8/1920 | NAKINA | |
| 4217 | HSWX | Min-Ad, Inc. | 4/70; added 7/70; eliminated 10/70 | NRHS | |
| 4218 | HSWX | *HERCULES PETROLEUM CO. | PWRC | ||
| 4219 | HSWX | *MIN-AD, INC. | PWRC | ||
| 4220 | HSX | Hamilton & Sons Canning Co. | 7/1937-4/1938 | NAKINA | |
| 4221 | HSX | Hamilton & Sons Canning Co. | Apr-38 | NRHS | |
| 4222 | HSX | HAMILTON & SONS CANNING CO. | PWRC | ||
| 4223 | HSXA | HAULSMART TRANSPORTATION LLC | SCAC4 | ||
| 4224 | HSXF | HAWAIIAN EXPRESS SERVICE INC | SCAC4 | ||
| 4225 | HSXL | H & S TRANSPORT LLC | SCAC4 | ||
| 4226 | HSXM | HOT SHOT EXPRESS INC | SCAC4 | ||
| 4227 | HSY | Sky Helicopteros | ICAO1 | ||
| 4228 | HSYT | HALL, STACY TRUCKING INC | SCAC4 | ||
| 4229 | HT | Howard Terminal | 1/1975 | NAKINA | |
| 4230 | HT | Howard Terminal | Jan-75 | NRHS | |
| 4231 | HT | HOWARD TERMINAL RAILWAY | PWRC | ||
| 4232 | HT | Hull Trains | UK | VKM | |
| 4233 | HTA | Helitrans | ICAO1 | ||
| 4234 | HTAA | HAMILTON TRANSPORT LLC | SCAC4 | ||
| 4235 | HTAB | HIND TRANSPORT | SCAC4 | ||
| 4236 | HTAC | HART'S TERMINAL&CARTAGE CO | SCAC1 | ||
| 4237 | HTAC | HIGHWAY TRANSPORT CHEMICAL LLC | SCAC4 | ||
| 4238 | HTAE | HTI LOGISTICS LLC | SCAC4 | ||
| 4239 | HTAK | HALBERSLEBEN TRUCKING | SCAC4 | ||
| 4240 | HTAM | HIGHLAND TRANSPORT | SCAC1 | ||
| 4241 | HTAM | HIGHLAND TRANSPORT (DIV OF TFI TRAN | SCAC4 | ||
| 4242 | HTAN | HULSE FARMS TRUCKING INC | SCAC4 | ||
| 4243 | HTAQ | HAMES TRUCKING CARRIER, INC. | SCAC4 | ||
| 4244 | HTAR | HITACHI TRANSPORT SYSTEM (AMERICA) | SCAC4 | ||
| 4245 | HTAS | HI-TECH AIR SHIPPING INC | SCAC4 | ||
| 4246 | HTAW | HAGEN TRUCKING INC | SCAC4 | ||
| 4247 | HTAY | HOUSTON INTERNATIONAL ENTERPRISES I | SCAC4 | ||
| 4248 | HTB | Horsens - Tørring Banen (Tørringbanen) | 1891 - 1929 | DK | jernbanen.dk |
| 4249 | HTB | Hörseltalbahn GmbH | Eisenach (Connex-Gruppe > Veolia Verkehr > Captrain) | D | privat-bahn.de |
| 4250 | HTB | Hellertalbahn GmbH | Betzdorf | D | privat-bahn.de |
| 4251 | HTB | Hörseltalbahn, Eisenach | D | TRAFFIC | |
| 4252 | HTB | Hörseltalbahn | DE | VKM | |
| 4253 | HTBB | HUGHES, B & B TRUCKING LLC | SCAC4 | ||
| 4254 | HTBC | HELMBOLT TRUCKING INC | SCAC4 | ||
| 4255 | HTBC | Hokkaido Takushoku Bus Co.,Ltd. | J | TRAFFIC | |
| 4256 | HTBD | HUNT TRANSPORTATION INC (BROKERAGE | SCAC4 | ||
| 4257 | HTBD | Horsens - Tørring Banen (Tørringbanen) | Real: HTB, 1891 - 1929 | DK | TRAFFIC |
| 4258 | HTBF | HEFFERNAN TRUCKING LLC | SCAC4 | ||
| 4259 | HTBI | HOT OIL TRANSPORT | SCAC4 | ||
| 4260 | HTBP | HT LOGISTICS LLC | SCAC4 | ||
| 4261 | HTBQ | HERSHEY TRANSPORT | SCAC4 | ||
| 4262 | HTBR | H T BAR INC | SCAC4 | ||
| 4263 | HTBT | HEIL TRUCK BROKERAGE INC | SCAC4 | ||
| 4264 | HTBV | HERBERT TRANSPORTATION INC | SCAC4 | ||
| 4265 | HTBW | HAMPTON TRANSPORT LLC | SCAC4 | ||
| 4266 | HTC | Haiti Trans Air | ICAO1 | ||
| 4267 | HTCD | HATCHER DAIRY FARM | SCAC4 | ||
| 4268 | HTCE | H T C EXPRESS INC | SCAC4 | ||
| 4269 | HTCG | HERRERA TRUCKING | SCAC4 | ||
| 4270 | HTCH | HATCHER TRUCKING COMPANY | SCAC1 | ||
| 4271 | HTCH | HATCHER TRUCKING COMPANY, INCORPORA | SCAC4 | ||
| 4272 | HTCI | HUTCHCRAFT VAN SVC INC | SCAC4 | ||
| 4273 | HTCJ | HEWITT TRUCKING COMPANY | SCAC4 | ||
| 4274 | HTCL | HODGE TRUCKING CO INC | SCAC4 | ||
| 4275 | HTCM | H2O COMPOSITES INC | SCAC4 | ||
| 4276 | HTCN | HTC TRUCKING LLC | SCAC4 | ||
| 4277 | HTCO | HETCO MOVING SYSTEMS INC | SCAC4 | ||
| 4278 | HTCP | H T C | SCAC4 | ||
| 4279 | HTCR | HURMAN TRUCKING COMPANY | SCAC4 | ||
| 4280 | HTCU | HALDOR TOPSOE A/S | SCAC4 | ||
| 4281 | HTCV | HELLENIC TANKERS CO LTD | SCAC4 | ||
| 4282 | HTCW | HUTCHISON TRUCKING INC | SCAC4 | ||
| 4283 | HTCX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | NAKINA | |
| 4284 | HTCX | General Electric Railcar Services Corp. | added 1/1994; eliminated 1/2000 | NAKINA | |
| 4285 | HTCX | Chrysler Rail Transportation Corp. | added 4/1991; eliminated 1/1994 | NAKINA | |
| 4286 | HTCX | Transportation Corp. of America | added 4/1974; 1/1975-1/1980; eliminated 4/1991 | NAKINA | |
| 4287 | HTCX | Arthur Equipment Co. | added 10/1971; eliminated 4/1974 | NAKINA | |
| 4288 | HTCX | Harbor Tank Line Co. | 7/1935-4/1970; eliminated 10/1971 | NAKINA | |
| 4289 | HTCX | Haffner Thrall Car Co. (Harbor Tank Line Co.) | 7/1930-7/1932 | NAKINA | |
| 4290 | HTCX | Harbor Tank Line Co. | 4/38-4/70; eliminated 10/71 | NRHS | |
| 4291 | HTCX | Arthur Equipment Co. | added 10/71 | NRHS | |
| 4292 | HTCX | Transportation Corp. of America | 1/75-1/80; eliminated 4/91 | NRHS | |
| 4293 | HTCX | Chrysler Rail Transportation Corp. | added 4/91; eliminated 1/94 | NRHS | |
| 4294 | HTCX | General Electric Railcar Services Corp. | added 1/94; eliminated 1/2000 | NRHS | |
| 4295 | HTCX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | NRHS | |
| 4296 | HTCX | (NATX) GENERAL ELECTRIC RAIL SERVICES CORPORATION [CHRYSLER RAIL TRANSPORTATION CORP; TRANSPORTATION CORP. OF AMERICA; ARTHUR EQUIPMENT CO.; HARBOR TANK LINE; HAFFNER THRALL CAR CO.] | PWRC | ||
| 4297 | HTCX | Transportation Corporation of America (GE Rail Services Corporation) | RSRV | ||
| 4298 | HTCX | GENERAL ELECTRIC RAILCAR SERVICES C | SCAC4 | ||
| 4299 | HTCY | HANOVER TRANSFER CO | SCAC1 | ||
| 4300 | HTCY | HASTINGS TRUCK COMPANY INC | SCAC4 |