The UK is trialing a ticketless rail fare system that tracks passengers' journeys via GPS on their mobile phones to calculate the lowest fare. Currently tested in northern England, the system allows passengers to check in and out using an app, which generates a barcode for ticket inspections. Similar systems are in use in Denmark, the Netherlands, and Switzerland, but concerns about user privacy have been raised regarding constant location tracking. Teljes cikk (Euronews.com)