| 1 | 1st Carrier after Origin Carrier |
| 2 | 2nd Carrier after Origin Carrier |
| 3 | 3rd Carrier after Origin Carrier |
| 4 | 4th Carrier after Origin Carrier |
| 5 | 5th Carrier after Origin Carrier |
| 6 | 6th Carrier after Origin Carrier |
| 7 | 7th Carrier after Origin Carrier |
| 8 | 8th Carrier after Origin Carrier |
| 9 | 9th Carrier after Origin Carrier |
| A | Origin Carrier, Agent's Routing (Rail) |
| B | Origin/Delivery Carrier (Any Mode) |
| D | DELY (Delivery Switch Carrier) |
| I | Origin Switch Carrier |
| O | Origin Carrier (Air, Motor, or Ocean) |
| R | Origin Carrier, Rule 11 Shipment |
| S | Origin Carrier, Shipper's Routing (Rail) |
| V | Intermediate Switch Carrier at Origin |
| Z | Mutually Defined |