About: Train reporting number

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.