Originally compiled by Jesse Koski.
Subsequent revisions by Ken Humphreys.
If you have any comments, corrections or additions, please e-mail P&WRR.
This file contains AAR assigned reporting marks that have been compiled from several sources. A limited number of common railroad abbreviations are also included. The list includes all active AAR reporting marks as of the end of 2007 plus many historical marks which are no longer in use.
* (Asterisk) or + (plus) Denotes duplicated or reassigned reporting marks among the various sources we have come across over the years. This is often due to the fact that the reporting mark had been retired long ago and reassigned, or the company was sold, bought out, merged and/or changed names. Some marks are also registered to equipment leasing companies which have leased the equipment to more than one customer, each of which used the mark. In some cases a mark may be shown as the mark of the leasing company and also as the mark of the lessee company.
Many of the duplicated reporting marks are also due to the many railroad mergers and purchases over the years. Since this is a compilation of many reporting marks lists, we have made no attempt to track down the history of the many companies in this list. In most cases, but not all, duplicated marks are listed with the oldest mark first. If the current holder of a duplicated or reassigned mark is known, the entry is preceded by +. If no + appears with a listing of duplicate marks, all of the marks designated with an * are inactive or discontinued.
In the absence of AAR assigned reporting marks, the AAR uniform Alpha code was used. A limited number of commonly used abbreviations for railroad names and terms is also included in this listing. Examples are MOW (maintenance of way) and UNK (railroad unknown).
Reporting marks, along with the car serial number, are used by shippers and railroads to identify specific pieces of rolling stock. All organizations with cars in interchange service are assigned reporting marks by the AAR. Some reporting marks may still be registered even though the organizations no longer have cars in interchange service or may still be awaiting delivery of ordered cars.
The uniform ALPHA code is assigned by the AAR to all organizations that may be involved in handling rail equipment. The ALPHA code usually, but NOT always, is the same as the reporting mark and, in the case of an organization that has no current or planned interchange equipment, is NOT to be considered as a reporting mark until so assigned. The ALPHA code is used by shippers and railroads to identify car-handling organizations for purpose of routing, billing, division of charges, etc.
Please note that for historical research purposes this list contains references to many companies that are known to no longer be in existence.
NOTE ALSO that reporting mark changes and additions occur frequently. Company names also change due to mergers and other reasons. If any errors, changes or omissions are noted in these listings, please bring them to the attention of P&WRR so that we may keep these listings as current and comprehensive as possible.
| (GATC) | GENERAL AMERICAN TRANSPORTATION CORP. |
| (BRECO) | BURLINGTON REFRIGERATOR EXPRESS CO. |
| (NCCO) | NATIONAL CAR COMPANY |
| (NACCO) | NORTH AMERICAN CAR CORPORATION |
| (NATX) | NORTH AMERICAN CAR CORPORATION |
| (ACL) | ARMOUR CAR LINES |
| (RCMX) | RAILROAD CAR MANAGEMENT CO. |
| X | PRIVATE CAR OWNERS |
| U | CONTAINERS |
| Z | TRAILERS |