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Le Metropolitain: Difference between revisions
Mission codes added.
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One of the main characteristics of the RER/Transilien network is its named routes. Due to the lines' length and their many branches, there are many different routes and service types a given train can take, and in order to reduce confusion, the routes (called "missions") are named with a four letter mission code. There are two naming schemes: RATP's scheme, used on RER A, B and C, and SNCF's scheme used on RER D and E as well as all Transilien lines:
* Under RATP's naming scheme, the first letter indicates the route's terminus, the second letter indicates the service type (E means omnibus, i.e. stops at all stations), the third and fourth letter are just there to make the name pronounceable, and after the code comes a number from 01 to 99, odd when westbound (line A)<ref>There was one exception for the last [[wikipedia:MS 61|MS 61]] train on 16 April 2016, when the number was 61 for the whole run: WBWN61 → NBZZ61 → ZNZZ61 → NZZZ61.</ref> or northbound (line B) and viceversa, and increased every time a train of the same mission leaves the first station; when the train counter reaches 100, the counter is resetted and the last two letters are changed. ''DROP24'', for example, means it stops at Noisy-le-Grand Mont d'Est (''D''), it's not omnibus (''R''), and it's the 12th train that has followed this mission so far. When the two last letters are ZZ (e.g. ''DRZZ''), this means the service has been changed for unexpected reasons such as an accident or the trains being on strike; when the first letter is a W, the train is completely nonstop and headed for the maintenance depots.
* Under SNCF's naming scheme, meanwhile, each letter has one meaning depending on the line. On RER D, for example, ''MIPE'' indicates a route that ends at Châtelet-Les Halles (''M''), nonstop between Gare de Lyon and Villeneuve-Saint Georges (''I''), through the Évry-Courcouronnes branch (''P''), and doesn't calls at Viry-Châtillon station (''E''). There is no train counter, and code ''VIDE'' (French for ''empty'') indicates a train that goes nonstop to the maintenance depots.
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