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Wikipedia definition
1. Train reporting numberA train reporting number is used by railway staff in Great Britain to identify a particular train service. It consists of: A single-digit number, indicating the class (type) of train A letter, indicating the destination area A two-digit number, identifying the individual train, or indicating the route (the latter generally for suburban services). The train reporting number is often called the headcode, a throwback to when the number was physically displayed at the head of a train.
Read “Train reporting number” on English Wikipedia
Read “列車番号” on Japanese Wikipedia
Read “Train reporting number” on DBpedia

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