Mission code
French train service identifier
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A mission code (French: code mission) is the term applied to a system used on the French railway network to identify particular train services.[1]
Mission code's are designed to provide information to passengers about trains. A mission code consists of up to four letters which represent an acronym for a given train's destination and route. On the Réseau Express Régional the first letter of the mission code is taken from the inital of the destination station, the second represents the service, the third letter is the initial's of the original departure station, and the fourth letter defines the route.[2] On some lines, such as Line J, the fourth letter of the mission code does not relay information about the service but is inluded as a memory aide.[3] Mission code's were first introduced the C line which now has 155 variants.[4][5]