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Groups of college or high school students accompanied by a teacher or groups of young people under 16 travelling as part of an educational, cultural, sporting or social outing organized by an association, a community or a public institution can travel on the Ile-de-France rail networks (metro, train, RER, tram express) with Origin-Destination tickets or single tickets at half-price. Par ailleurs, les enfants de 4 à moins de 10 ans peuvent voyager en Île-de-France avec des tickets et billets à demi-tarif (carnet de tickets t+, billets Origine-Destination et billets Orlyval). Les enfants de 4 à 11 ans inclus peuvent par ailleurs bénéficier du tarif Enfant sur le forfait Paris Visite (50% de réduction par rapport au plein tarif).
the group must be of more than 10 young people (beyond this threshold of 10 young people, an additional adult can also travel at the reduced fare)
This reduction is not valid on the bus and tram networks, nor on airport rail services (Orlyval, Roissy by RER B and Orly by RER C).