Reporting marks on two Canadian Pacific Railway (CP) covered hoppers passing Wisconsin Dells, Wisconsin. The left one is CP 388686 and the right is SOO 115239.

A reporting mark is a two-to-four-letter alphabetic code used to identify owners or lessees of rolling stock and other equipment used on the North American railroad network. The marks are stenciled on each piece of equipment, along with a one-to-six-digit number, which together uniquely identify every such rail car. This allows the cars to be tracked by the railroad they are traveling over, which shares the information with other railroads and customers.^[1][2]

[edit] Standard practices

The Association of American Railroads assigns marks to all carriers, under authority granted by the U.S. Surface Transportation Board, Canadian Transportation Agency, and Mexican Government. Under current practice, the first letter must match the initial letter of the railroad name. As it also acts as a Standard Carrier Alpha Code, the reporting mark cannot conflict with codes in use by other non-rail carriers.^[1][2]

Marks ending in X are assigned to companies or individuals that own railcars, but are not operating railroads; for example, the TTX Company (formerly Trailer Train Company) is named for its original reporting mark of TTX. Companies owning trailers used in trailer-on-flatcar service are assigned marks ending in Z, and the National Motor Freight Traffic Association, which maintains the list of Standard Carrier Alpha Codes, assigns marks ending in U to owners of intermodal containers.^[1][2]

When the owner of a reporting mark is taken over by another company, the old mark remains the property of the new company. For example, when the Union Pacific Railroad (mark UP) acquired the Chicago and North Western Railway (mark CNW) in the 1990s, it retained the CNW mark rather than immediately repaint all acquired equipment. Some companies own several marks that are used to identify different classes of cars, such as boxcars or gondolas.^[2]

Intermodal equipment consisting of a DTTX double-stack car and two PACU shipping containers.

A tank car with BNSF markings.

Close-up of a covered hopper with SHPX markings.

A Railbox boxcar with RBOX markings.

[edit] List of reporting marks

Due to this list's size, it has been split into subpages based on the first letter of the reporting mark:

[edit] See also

• UIC Country Code – A series of prefixes used on rolling stock identification numbers by members of the International Union of Railways (UIC) to identify the country of origin of railway rolling stock.

[edit] References

[edit] External links

• Nakina.Net – Reporting Marks – Unofficial incomplete compilation of reporting marks from the 1920s to the present day, as listed in the Official Railway Equipment Register. (Does not include U & Z markings.)
• National Railway Historical Society Railroad Reporting Marks (2001)
• Railinc./FindUs.Rail Database – search the UMLER informational system by markings (current marks only)