| 1001 | HDON | HODGDON BROS & SONS INC | SCAC4 | ||
| 1002 | HDOP | HOODS OIL COMPANY INC | SCAC4 | ||
| 1003 | HDOT | HONDO TRUCKING INC | SCAC4 | ||
| 1004 | HDPL | HAND, PAUL | SCAC4 | ||
| 1005 | HDR | Helikopterdrift | ICAO1 | ||
| 1006 | HDRC | HANDRICH TRUCKING INC | SCAC4 | ||
| 1007 | HDRI | HOOD TRANSPORTATION | SCAC4 | ||
| 1008 | HDRK | HINDRIKS, GEORGE | SCAC4 | ||
| 1009 | HDRM | HEIDMAR INC | SCAC4 | ||
| 1010 | HDRN | HENDRICKSON TRANSPORTATION LLC | SCAC4 | ||
| 1011 | HDRQ | H D R | SCAC4 | ||
| 1012 | HDRT | HYDRA TRANSPORT | SCAC4 | ||
| 1013 | HDRX | Helm Diamond Rail Leasing | added 10/2008 | NAKINA | |
| 1014 | HDRX | HELM DIAMOND RAIL LEASING | PWRC | ||
| 1015 | HDS | UEF Historischer Damfschnellzug e.V | DE | VKM | |
| 1016 | HDSA | HERITAGE DEDICATED SERVICES INC | SCAC4 | ||
| 1017 | HDSB | HDS EXPRESS | SCAC4 | ||
| 1018 | HDSC | HENDERSCHIED | SCAC4 | ||
| 1019 | HDSD | HACKBARTH DELIVERY SERVICE INC | SCAC4 | ||
| 1020 | HDSF | HUMPTY DUMPTY SNACK FOODS USA INC | SCAC4 | ||
| 1021 | HDSG | HARRIS DATA STORAGE INC | SCAC4 | ||
| 1022 | HDSH | HD SHIPPING LTD | SCAC4 | ||
| 1023 | HdSJ | Härnösand - Sollefteå Järnväg | 1893 - 1932 | S | svenska-lok.se |
| 1024 | HDSK | H-D-SOUCY INC | SCAC4 | ||
| 1025 | HDSL | HENDERSON LOGISTIC | SCAC4 | ||
| 1026 | HDSO | HARDISON TRANSPORTATION LLC | SCAC4 | ||
| 1027 | HDSP | HYLAND, SEAN MOTORSPORT | SCAC4 | ||
| 1028 | HDSS | HDS EXPRESS LINES | SCAC4 | ||
| 1029 | HDSU | HAYS DISTRIBUTION SERVICES LTD | SCAC4 | ||
| 1030 | HDSX | The CIT Group/Capital Finance, Inc. | added 10/2003; 7/2005 | NAKINA | |
| 1031 | HDSX | RailAmerica Equipment Corp. | added 10/1996; 7/2000; eliminated 1/2003 | NAKINA | |
| 1032 | HDSX | Huron Distribution Services/Rail America Equipment Corp. | added 7/1996; eliminated 10/1996 | NAKINA | |
| 1033 | HDSX | Huron Distribution Services | 1/1994 (not listed) | NAKINA | |
| 1034 | HDSX | H.D. Schrier | added 7/1961; 7/1965; eliminated 7/1966; added 4/1967; 4/1970; eliminated 10/1974 | NAKINA | |
| 1035 | HDSX | H.D. Schrier | 7/65; eliminated 7/66; added 4/67; 4/70; eliminated 10/74 | NRHS | |
| 1036 | HDSX | Huron Distribution Services | Jan-94 | NRHS | |
| 1037 | HDSX | Huron Distribution Services/Rail America Equipment Corp. | added 7/96; eliminated 10/96 | NRHS | |
| 1038 | HDSX | RailAmerica Equipment Corp. | added 10/96; 7/2000 | NRHS | |
| 1039 | HDSX | *H. D. SCHRIER | PWRC | ||
| 1040 | HDSX | *HURON DISTRIBUTION SERVICES | PWRC | ||
| 1041 | HDSX | +THE CIT GROUP/CAPITAL FINANCE [RAIL AMERICA EQUIPMENT CORP.] | PWRC | ||
| 1042 | HDSX | RailAmerica Equipment Corporation | RSRV | ||
| 1043 | HDSX | CIT GROUP/CAPITAL FINANCE INC, THE | SCAC4 | ||
| 1044 | HDSY | HUNTE DELIVERY SYSTEM INC | SCAC4 | ||
| 1045 | HDT | HOT DOGGER TOURS INC | SCAC4 | ||
| 1046 | HDTB | HEAVY DUTY TRANSPORT | SCAC4 | ||
| 1047 | HDTC | HURD, TRACEY | SCAC4 | ||
| 1048 | HDTD | HEAVY DUTY TRUX LTD | SCAC4 | ||
| 1049 | HDTE | HOLIDAY TREE FARMS INC | SCAC4 | ||
| 1050 | HDTH | HALVERSON, DAN TRUCKING | SCAC4 | ||
| 1051 | HDTI | HERMAN, DANNY TRUCKING INC | SCAC4 | ||
| 1052 | HDTK | HOOD TRUCKING | SCAC4 | ||
| 1053 | HDTM | H D T | SCAC4 | ||
| 1054 | HDTN | HEAVY DUTY TRANSAXLE INC | SCAC4 | ||
| 1055 | HDTT | HANNAH, DAVID TRANSPORTATION | SCAC4 | ||
| 1056 | HDTX | Sun Products Corp. | added 1/2009 | NAKINA | |
| 1057 | HDTX | Huish Detergents, Inc. | added 4/2007; eliminated 1/2009 | NAKINA | |
| 1058 | HDTX | HUISH DETERGENTS, INC. | PWRC | ||
| 1059 | HDTX | SUN PRODUCTS CORPORATION | SCAC4 | ||
| 1060 | HDUG | DHUGGA TRUCKING LTD | SCAC4 | ||
| 1061 | HDVF | HDVS FREIGHT SYSTEMS INC | SCAC4 | ||
| 1062 | HDVS | HOLIDAY VAN & STORAGE | SCAC4 | ||
| 1063 | HDW | Hafendienste Wilhelmshaven GmbH | Wilhelmshafen | D | privat-bahn.de |
| 1064 | HDWC | HEADWIN LOGISTICS CO LTD | SCAC4 | ||
| 1065 | HDWE | HODGINS, DWAYNE | SCAC4 | ||
| 1066 | HDWH | HICKMAN, DALE W HAULING | SCAC4 | ||
| 1067 | HDWL | HADDIX, WILLIAM | SCAC4 | ||
| 1068 | HDX | Hooker-Detrex Inc. | 1/1950-7/1954; eliminated 10/1956 | NAKINA | |
| 1069 | HDX | Hooker-Detrex Inc. | Jan-52 | NRHS | |
| 1070 | HDX | HOOKER-DETREX INC. | PWRC | ||
| 1071 | HDXC | HERDRICH TRANSPORT LLC | SCAC4 | ||
| 1072 | HDXL | HD TRANSPORTATION LLC | SCAC4 | ||
| 1073 | HDXN | HILLSIDE TRANSPORT INC | SCAC4 | ||
| 1074 | HDXO | HENDRIX OIL INC | SCAC4 | ||
| 1075 | HDXS | HAMMOND TRANSPORTATION INC | SCAC4 | ||
| 1076 | HDXU | HDS LINES | SCAC4 | ||
| 1077 | HDYC | HANDY TRUCKING COMPANY LLC | SCAC4 | ||
| 1078 | HDYE | HARDY, EARL TRUCKING INC | SCAC4 | ||
| 1079 | HDYK | HEAVY DUTY TRUCKERS LLC | SCAC4 | ||
| 1080 | HDYL | HUB DELIVERY INC | SCAC4 | ||
| 1081 | HDYO | HARDY OIL TRANSPORT | SCAC4 | ||
| 1082 | HE | Hollis & Eastern R.R. Co. | 1/1975-7/2005 | NAKINA | |
| 1083 | HE | Hartford Eastern Ry. | 7/1923-7/1932 | NAKINA | |
| 1084 | HE | Hollis & Eastern R.R. Co. | 1/75-7/2000 | NRHS | |
| 1085 | HE | Historische Eisenbahn e.V. | Frankfurt | D | privat-bahn.de |
| 1086 | HE | *HARTFORD EASTERN RWY. | PWRC | ||
| 1087 | HE | +HOLLIS & EASTERN RAILROAD | PWRC | ||
| 1088 | HE | Hollis and Eastern Railroad | RSRV | ||
| 1089 | HE | HOLLIS & EASTERN R R CO | SCAC4 | ||
| 1090 | HE | Hollis & Eastern R.R. Co. | USA | TRAFFIC | |
| 1091 | HE | Hugo Ehlers GmbH & Co Kg | DE | VKM | |
| 1092 | HEA | Heliavia-Transporte Aereo | ICAO1 | ||
| 1093 | HEAA | HEART TRANSPORTATION | SCAC4 | ||
| 1094 | HEAB | HEADRUSH | SCAC4 | ||
| 1095 | HEAC | HEGGELUND, DANNIE | SCAC4 | ||
| 1096 | HEAD | HEAD LINES (MCLEAN KENNEDY LTD) | PWRC | ||
| 1097 | HEAD | HUBTRUCKER | SCAC4 | ||
| 1098 | HEAG | Hessische Elektrizitäts AG | City: Darmstadt | D | TRAFFIC |
| 1099 | HEAH | HARIBON EXPRESS LLC | SCAC4 | ||
| 1100 | HEAI | HISTORICAL EQUIPMENT ASSOCIATION | PWRC |