Which technology advancement has most significantly transformed ticket purchasing and validation for train transportation in the past decade?

The transportation industry has undergone significant technological advancements in recent years, particularly in railway systems. High-speed trains, smart ticketing, and enhanced passenger experiences are transforming how we travel. This trivia question focuses on retail technology advancements specifically in the train transportation sector, testing your knowledge about how modern commerce solutions are being integrated into rail travel experiences.

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Mobile ticketing with QR code validation
Blockchain-based ticketing systems
Biometric fingerprint scanners at station gates
RFID implant technology for passengers