Standard Practices
The Association of American Railroads assigns marks to all carriers, under authority granted by the US 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 nonrail carriers.
Marks ending in X are assigned to companies which or individuals who 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. In another example, the reporting mark for state-funded Amtrak services in California is CDTX (whereas the usual Amtrak mark is AMTK) because the state transportation authority Caltrans owns the used cars. This is why the reporting mark for CSX Transportation, which is an operating railroad, is CSXT instead of CSX.
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.
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. If the acquiring company discontinues the name or mark of the acquired company, the discontinued mark is referred to as a "fallen flag" railway.
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Intermodal equipment consisting of a DTTX double-stack car and
two PACU shipping containers -
A tank car with BNSF markings
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A covered hopper with SHPX markings
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A Railbox boxcar with RBOX markings
Read more about this topic: Reporting Mark
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