ENSZ
| Norfolk Southern Railway Company | 5 |
FLXZ
| Flexi-Van Leasing Incorporated | 1 |
FSTZ
| Fastrac Intermodal LLC | 3 |
JBHZ
| J. B. Hunt Transport Incorporated | 5 |
KCSZ
| Kansas City Southern Railway Company | 1 |
NSFZ
| Norfolk Southern Railway Company | 7 |
NSPZ
| Norfolk Southern Railway Company | 15 |
TTRZ
| Train Trailer Rentals Limited | 1 |
UPHZ
| Union Pacific Railroad Company | 1 |
ZNSU
| Norfolk Southern Corporation | 14 |