Train reporting number

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A train reporting number in Great Britain identifies a particular train service. It consists of:

• A single-digit number, indicating the class (type) of train, followed by
• A letter, indicating the destination area, followed by
• 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.