Summer sorted: Interrail winter discount can be used until next autumn - This is the best day to buy an Interrail unlimited train pass for Europe - but you must be quick - Here's how to get up to 90% discount on train, bus and Interrail travel for 18-30s resident in Spain - El Gobierno renueva el 'Plan Verano Joven', con descuentos de hasta el 90% en billetes de tren, autobus e Interrail