ALLZ
| Alliance Shippers Incorporated | 1 |
APMZ
| Maersk Equipment Service Co. | 1 |
BN
| Burlington Northern | 1 |
BNZ
| Burlington Northern and Santa Fe Railway | 1 |
CBQZ
| Chicago, Burlington & Quincy | 1 |
JBHZ
| J. B. Hunt Transport Incorporated | 1 |
KCSZ
| Kansas City Southern Railway Company | 2 |
MPZ
| Missouri Pacific | 1 |
NWZ
| Norfolk & Western | 1 |
SFTZ
| Santa Fe | 2 |
TIPZ
| TIP Intermodal Services | 1 |
TSXZ
| Transamerica Leasing Incorporated | 1 |
UPZ
| Union Pacific Railroad Company | 3 |
USAZ
| XTRA Intermodal | 1 |
VTRZ
| Vermont Railway Incorporated | 1 |