| Abbreviation | Definition |
|---|---|
| HOEU | Hoechst Aktiengesellschaft |
| HOG | Heart of Georgia Railroad |
| HOGX | Harlis Oil & Gas (Union Pacific Railroad) |
| HOKX | Hooker Chemical (Occidental Chemical Corporation) |
| HOKX | Occidental Chemical Corporation |
| HOL | Hollywood Station (Tri Rail - AMTK) |
| HOMX | Home Oil (PLM International) |
| HOMX | PLM International Incorporated |
| HONX | Honeymead Products (Division of Harvest States Cooperatives) |
| HONX | Honeymead Products Company (Division of Harvest States Cooperatives) |
| HOS | Hoosier Southern Railroad |
| HOS | Houston Amtrak Station |
| HOSC | Indiana and Eastern Railroad: The Hoosier Connection (Norfolk Southern) |
| HOTX | Chicago Freight Car Leasing |
| HOWZ | Flex-Van Leasing |
| HOYU | Hoyer GMBH Internationale |
| HPAX | Hammermill Paper (International Paper) |
| HPAX | International Paper Company |
| HPCX | Hercules |
| HPCX | Hercules Incorporated |