| Naics index | Naics index description |
|---|---|
| 485119 | Street railway systems (except mixed mode), commuter |
| 485119 | Streetcar systems (except mixed mode), commuter |
| 485119 | Subway systems (except mixed mode), commuter |
| 485119 | Tramway systems (except mixed mode), commuter |
| 485119 | Trolley systems (except mixed mode), commuter |
| 485210 | Bus line operation, intercity |
| 485210 | Intercity bus line operation |
| 485210 | Interstate bus line operation |
| 485210 | Interurban bus line operation |
| 485210 | Motor coach operation, interurban and rural |