| 1 | HT | Howard Terminal | 1/1975 | NAKINA | |
| 2 | HT | Howard Terminal | Jan-75 | NRHS | |
| 3 | HT | HOWARD TERMINAL RAILWAY | PWRC | ||
| 4 | HT | Hull Trains | UK | VKM | |
| 5 | HTA | Helitrans | ICAO1 | ||
| 6 | HTAA | HAMILTON TRANSPORT LLC | SCAC4 | ||
| 7 | HTAB | HIND TRANSPORT | SCAC4 | ||
| 8 | HTAC | HART'S TERMINAL&CARTAGE CO | SCAC1 | ||
| 9 | HTAC | HIGHWAY TRANSPORT CHEMICAL LLC | SCAC4 | ||
| 10 | HTAE | HTI LOGISTICS LLC | SCAC4 | ||
| 11 | HTAK | HALBERSLEBEN TRUCKING | SCAC4 | ||
| 12 | HTAM | HIGHLAND TRANSPORT | SCAC1 | ||
| 13 | HTAM | HIGHLAND TRANSPORT (DIV OF TFI TRAN | SCAC4 | ||
| 14 | HTAN | HULSE FARMS TRUCKING INC | SCAC4 | ||
| 15 | HTAQ | HAMES TRUCKING CARRIER, INC. | SCAC4 | ||
| 16 | HTAR | HITACHI TRANSPORT SYSTEM (AMERICA) | SCAC4 | ||
| 17 | HTAS | HI-TECH AIR SHIPPING INC | SCAC4 | ||
| 18 | HTAW | HAGEN TRUCKING INC | SCAC4 | ||
| 19 | HTAY | HOUSTON INTERNATIONAL ENTERPRISES I | SCAC4 | ||
| 20 | HTB | Horsens - Tørring Banen (Tørringbanen) | 1891 - 1929 | DK | jernbanen.dk |
| 21 | HTB | Hörseltalbahn GmbH | Eisenach (Connex-Gruppe > Veolia Verkehr > Captrain) | D | privat-bahn.de |
| 22 | HTB | Hellertalbahn GmbH | Betzdorf | D | privat-bahn.de |
| 23 | HTB | Hörseltalbahn, Eisenach | D | TRAFFIC | |
| 24 | HTB | Hörseltalbahn | DE | VKM | |
| 25 | HTBB | HUGHES, B & B TRUCKING LLC | SCAC4 | ||
| 26 | HTBC | HELMBOLT TRUCKING INC | SCAC4 | ||
| 27 | HTBC | Hokkaido Takushoku Bus Co.,Ltd. | J | TRAFFIC | |
| 28 | HTBD | HUNT TRANSPORTATION INC (BROKERAGE | SCAC4 | ||
| 29 | HTBD | Horsens - Tørring Banen (Tørringbanen) | Real: HTB, 1891 - 1929 | DK | TRAFFIC |
| 30 | HTBF | HEFFERNAN TRUCKING LLC | SCAC4 | ||
| 31 | HTBI | HOT OIL TRANSPORT | SCAC4 | ||
| 32 | HTBP | HT LOGISTICS LLC | SCAC4 | ||
| 33 | HTBQ | HERSHEY TRANSPORT | SCAC4 | ||
| 34 | HTBR | H T BAR INC | SCAC4 | ||
| 35 | HTBT | HEIL TRUCK BROKERAGE INC | SCAC4 | ||
| 36 | HTBV | HERBERT TRANSPORTATION INC | SCAC4 | ||
| 37 | HTBW | HAMPTON TRANSPORT LLC | SCAC4 | ||
| 38 | HTC | Haiti Trans Air | ICAO1 | ||
| 39 | HTCD | HATCHER DAIRY FARM | SCAC4 | ||
| 40 | HTCE | H T C EXPRESS INC | SCAC4 | ||
| 41 | HTCG | HERRERA TRUCKING | SCAC4 | ||
| 42 | HTCH | HATCHER TRUCKING COMPANY | SCAC1 | ||
| 43 | HTCH | HATCHER TRUCKING COMPANY, INCORPORA | SCAC4 | ||
| 44 | HTCI | HUTCHCRAFT VAN SVC INC | SCAC4 | ||
| 45 | HTCJ | HEWITT TRUCKING COMPANY | SCAC4 | ||
| 46 | HTCL | HODGE TRUCKING CO INC | SCAC4 | ||
| 47 | HTCM | H2O COMPOSITES INC | SCAC4 | ||
| 48 | HTCN | HTC TRUCKING LLC | SCAC4 | ||
| 49 | HTCO | HETCO MOVING SYSTEMS INC | SCAC4 | ||
| 50 | HTCP | H T C | SCAC4 | ||
| 51 | HTCR | HURMAN TRUCKING COMPANY | SCAC4 | ||
| 52 | HTCU | HALDOR TOPSOE A/S | SCAC4 | ||
| 53 | HTCV | HELLENIC TANKERS CO LTD | SCAC4 | ||
| 54 | HTCW | HUTCHISON TRUCKING INC | SCAC4 | ||
| 55 | HTCX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | NAKINA | |
| 56 | HTCX | General Electric Railcar Services Corp. | added 1/1994; eliminated 1/2000 | NAKINA | |
| 57 | HTCX | Chrysler Rail Transportation Corp. | added 4/1991; eliminated 1/1994 | NAKINA | |
| 58 | HTCX | Transportation Corp. of America | added 4/1974; 1/1975-1/1980; eliminated 4/1991 | NAKINA | |
| 59 | HTCX | Arthur Equipment Co. | added 10/1971; eliminated 4/1974 | NAKINA | |
| 60 | HTCX | Harbor Tank Line Co. | 7/1935-4/1970; eliminated 10/1971 | NAKINA | |
| 61 | HTCX | Haffner Thrall Car Co. (Harbor Tank Line Co.) | 7/1930-7/1932 | NAKINA | |
| 62 | HTCX | Harbor Tank Line Co. | 4/38-4/70; eliminated 10/71 | NRHS | |
| 63 | HTCX | Arthur Equipment Co. | added 10/71 | NRHS | |
| 64 | HTCX | Transportation Corp. of America | 1/75-1/80; eliminated 4/91 | NRHS | |
| 65 | HTCX | Chrysler Rail Transportation Corp. | added 4/91; eliminated 1/94 | NRHS | |
| 66 | HTCX | General Electric Railcar Services Corp. | added 1/94; eliminated 1/2000 | NRHS | |
| 67 | HTCX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | NRHS | |
| 68 | 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 | ||
| 69 | HTCX | Transportation Corporation of America (GE Rail Services Corporation) | RSRV | ||
| 70 | HTCX | GENERAL ELECTRIC RAILCAR SERVICES C | SCAC4 | ||
| 71 | HTCY | HANOVER TRANSFER CO | SCAC1 | ||
| 72 | HTCY | HASTINGS TRUCK COMPANY INC | SCAC4 | ||
| 73 | HTCZ | HIBBING TACONITE CO. | PWRC | ||
| 74 | HTDA | HENDERSON TRUCKING INC | SCAC4 | ||
| 75 | HTDD | HUNTLEY TRUCKING CO | SCAC4 | ||
| 76 | HTDF | HARTILL HEAVY HAUL INC | SCAC4 | ||
| 77 | HTDG | HEADWATERS TRUCKING INC | SCAC4 | ||
| 78 | HTDI | HAGAN TRANSPORT LLC | SCAC4 | ||
| 79 | HTDL | H T D TRUCKING | SCAC4 | ||
| 80 | HTDN | HERNANDEZ TRUCKING | SCAC4 | ||
| 81 | HTDO | HOFER TRUCKING | SCAC4 | ||
| 82 | HTDR | HI TECH DESERT EXPRESS INC | SCAC4 | ||
| 83 | HTDT | HILLSIDE TRANSPORTATION LLC | SCAC4 | ||
| 84 | HTDV | HARPS, TIMOTHY | SCAC4 | ||
| 85 | HTDW | HOLDER, TED W TRUCKING | SCAC4 | ||
| 86 | HTDY | HEAVENBOUND TRANSPORT INC | SCAC4 | ||
| 87 | HTE | Midwest Helicopters De Mexico | ICAO1 | ||
| 88 | HTEC | HI-TECH CARGO, INC | SCAC1 | ||
| 89 | HTEL | HANSERS TRUCKING LLC | SCAC4 | ||
| 90 | HTEN | HOKER TRUCKING LLC | SCAC4 | ||
| 91 | HTEO | HEMCHAK TRUCKING LLC | SCAC4 | ||
| 92 | HTEQ | HYPATIA TRANSPORT | SCAC4 | ||
| 93 | HTFB | HALLWAY TRANSPORT LLC | SCAC4 | ||
| 94 | HTFH | HORST TRUCKING | SCAC4 | ||
| 95 | HTFJ | HILLCORP TRANSPORTATION LLC | SCAC4 | ||
| 96 | HTFM | HILLTOP FARMS LEASING INC | SCAC4 | ||
| 97 | HTFO | HERCHE TRANSFER INC | SCAC4 | ||
| 98 | HTFW | HOLTZMAN TRANSPORT LLC | SCAC4 | ||
| 99 | HTG | Grossmann Air Service | ICAO1 | ||
| 100 | HTGC | HALO TRUCKING LLC | SCAC4 |