 |
| Subject | English | Thesaurus |
| abbr., file.ext. | CD Audio Track | .cda (file name extension) |
| NASA | flexible levitation on track | FLOAT (MichaelBurov) |
| railw., abbr. | On-Track Railcar Services Incorporated | HRRX |
| railw., abbr. | On-Track Railcar Services Incorporated | ONTX |
| railw., abbr. | On-Track Railway Services Limited | OTRX |
| sport., abbr. | Track Impact Program | TIP |