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Wikipedia definition
1. Reporting markA reporting mark is a two-, three-, or 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.
Read “Reporting mark” on English Wikipedia
Read “報告記号” on Japanese Wikipedia
Read “Reporting mark” on DBpedia

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