On Selasa, 23 April 2013
| ZBTX | = | Zalev Brothers Scrap Yard |
| ZCAX | = | Zinc Corporation of America |
| ZCCX | = | Zeigler Coal Company |
| ZIPX | = | Zip Transportation Company |
| ZRNX | = | Zurn Industries (Erie City Energy Division) |
| ZTLX | = | Ziol Tank Line |
| ZTTX | = | Trailer Train Company |
| ZVBX | = | Ferrous Processing and Trading Company |
Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.
