Which IoT innovation has most significantly reduced unplanned downtime in modern train systems by enabling predictive maintenance?

The transportation industry is rapidly evolving with Internet of Things (IoT) technology transforming how we move people and goods. Smart sensors, real-time data analytics, and connected systems are revolutionizing everything from passenger experience to maintenance operations. This poll tests your knowledge about one of the most significant IoT implementations in public transportation that's changing how train systems operate worldwide.

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LIDAR-based passenger counting systems that optimize carriage deployment
Vibration and acoustic sensors that detect early signs of mechanical failure in critical components
GPS-enabled freight tracking tags that prevent cargo misrouting
Automated ticketing systems with blockchain verification