BNAU
| Burlington Northern and Santa Fe Railway Company | 6 |
CMCZ
| Crowley Maritime Corporation | 1 |
FLXZ
| Flexi-Van Leasing Incorporated | 1 |
NSFZ
| Norfolk Southern Railway Company | 18 |
NSPZ
| Norfolk Southern Railway Company | 14 |
TSNZ
| TSNZ | 2 |
ZNSU
| Norfolk Southern Corporation | 7 |