| REPORTING MARKS | COMPANY |
|---|---|
| ABFZ | ABF Freight System |
| ALLZ | Alliance Shippers |
| AVAZ | Availco XTRA Inc. |
| AXXZ | Clipper |
| BMDZ | Minnesota, Dakota, & Western Railway Company |
| BNZ | Burlington Northern Railroad Company merged into Burlington Northern Santa Fe |
| BRNZ | Contrak Logistics |
| CCEZ | Chicago, Central, & Pacific Railroad Company |
| CCIZ | Crete Carrier Corp |
| CCTZ | Crowley Maritime |
| CFKZ | XTRA Inc. |
| CFWZ | Consolidated Freightways (bankrupt) |
| CLTZ | Cool Tracks |
| CMCZ | Crowley Maritime |
| CNPZ | Canadian National Railways |
| CNWZ | Chicago & North Western Transportation Company merged into Union Pacific |
| CPPZ | Canadian Pacific Ltd. |
| CRMZ | Conrail Mercury Inc. |
| CRZ | Consolidated Rail Corp. |
| CSRZ | CSX Transportation Company Inc. |
| CSXZ | CSX Transportation Company Inc. |
| CXPZ | CSX Transportation Company Inc. |
| DALZ | D&A Leasing |
| ENGZ | C. R. England & Sons |
| FECZ | Florida East Coast Railway Company |
| FEXZ | Florida East Coast Railway Company |
| FSTZ | United Parcel Service |
| HSFZ | JB Hunt-Santa Fe Quantum Service |
| ICGZ | Illinois Central Gulf Railroad Company changed to Illinois Central Railroad Co. |
| ICRZ | Illinois Central Railroad Company |
| IIRZ | III Transportation |
| IMXZ | Intermodal Express Inc. |
| IRMZ | Iowa Interstate Railroad Ltd. |
| JBHZ | J.B. Hunt |
| KBSZ | Kankakee, Beaverville, & Southern |
| KCSZ | Kansas City Southern Railway Company |
| KKLZ | Seaboard Marine Ltd. |
| KLMZ | KLLM Transport Services Inc. |
| KNTZ | Timothy Kennedy Inc. |
| MAR | Martrac (now UPS Logistics Group) |
| MIAB | Seaboard Marine |
| MILZ | Milwaukee Road merged into Soo Line |
| MKTZ | Missouri Kansas & Texas merged into Union Pacific |
| MTLZ | Marten Transport Ltd. |
| NACZ | Nashville & Ashland City Railroad Company |
| NSZ | Norfolk Southern Railway Company |
| OVNZ | Overnite Transportation Co. |
| PRMZ | Puerto Rico Maritime Shipping Authority |
| QMTZ | JB Hunt |
| RDWZ | Roadway Express |
| REAZ | Transamerica Transportation Services Inc. bought by TIP |
| REDZ | REDON Inc. bought by TIP |
| RGTZ | Denver & Rio Grande Western Railroad Company |
| RSPZ | Southern Pacific Transportation Co. |
| RWTZ | Satellite Intermodal Express |
| RXXZ | Transamerica Transportation Services Inc. bought by TIP |
| SBDZ | Seaboard Systems merged into CSX Transportation |
| SFTZ | Atchison, Topeka & Santa Fe Railway merged into Burlington Northern Santa Fe |
| SFVZ | Atchison, Topeka, & Santa Fe Railway merged into Burlington Northern Santa Fe |
| SKRZ | Strick Lease Inc. |
| SMLZ | Seaboard Marine Ltd. |
| SOOZ | Soo Line Railroad Company merged into Canadian Pacific |
| SOUZ | Southern Railway Company merged into Norfolk Southern |
| SPLZ | Southern Pacific Transportation Company |
| TDSZ | TransAmerica Distribution Services |
| TIPZ | TIP Lease |
| TMPZ | TIP Lease |
| TMTZ | Crowley Maritime |
| TPZ | Missouri Pacific Railroad Company |
| TPWZ | Toledo, Peoria, & Western Railway Corp. |
| TRBR | Trailer Bridge |
| TTOZ | Totem Ocean Trailer Express |
| UPZ | Union Pacific Railroad Company |
| UPSZ | United Parcel Service |
| USAZ | XTRA Inc. |
| VIPZ | Vermont Railway Inc. |
| VRYZ | Vermont Railway Inc. |
| VTRZ | Vermont Railway Inc. |
| WERZ | Werner Enterprises |
| WOLZ | H. O. Wolding |
| WTLZ | WTL Rail Corporation |
| XTRZ | XTRA Inc. |
| YFSZ | Yellow Freight System |