UIC Leaflet 918-1 describes the regulations and procedures to be observed when exchanging messages between a RU that issues travel tickets and reservation tickets and the electronic system of the RU which manages the necessary data for the issue of these tickets, in particular the inventories of seats available for reservation. It is supplemented by the following two leaflets:
UIC Leaflet 918-0 which deals with the general arrangements for electronic seat reservation and the electronic preparation of travel documents;
UIC Leaflet 918-2 which describes the standard RCT2 that applies to all the travel documents prepared electronically (the only people allowed access to this Leaflet are the correspondents whose names are on the list held by the UIC Passenger Department)
The arrangements contained in these Leaflets enable a RU to reserve seats from an inventory managed by another RU and to issue any travel document (in particular seat reservations and combined tickets) produced electronically from data transmitted by the electronic system of another RU.
Note: the term "seat" in this leaflet is to identify the group of services e.g. berth, bicycle, seats, etc. but can also be used to address a seat.