| Abbreviation | Definition |
|---|---|
| HSFZ | Atchison, Topeka and Santa Fe Railway (BNSF Railway) |
| HSH | Albania Hekurudhaea SHqlperise |
| HSIX | Housing Starts Inc. |
| HSIX | Housing Starts Incorporated |
| HSLU | Haulage Services |
| HSLU | Haulage Services Limited |
| HSR | Hamilton Street Railway |
| HSRR | Hardin Southern Railroad |
| HSRR | Hardin Southern Railroad Incorporated |
| HSRZ | H and S Railroad |
| HSRZ | H and S Railroad Company Incorporated |
| HSW | Helena Southwestern Railroad |
| HTCX | General Electric Railcar Services Corporation |
| HTCX | Transportation Corporation of America (GE Rail Services Corporation) |
| HTIU | Hudson Technologies |
| HTMU | Hansen and Tidemann |
| HTMU | Hansen and Tidemann Incorporated |
| HTR | Hail The Rail |
| HTSU | High Tech Transport |
| HTSU | High Tech Transport Limited |