Which transportation innovation was FIRST introduced in the Japanese Shinkansen N700S bullet train in 2020, setting it apart from previous models?

The transportation industry has seen revolutionary changes in high-speed rail technology over the past few decades. Different countries have competed to develop the fastest, most efficient, and most sustainable rail systems. This trivia question focuses on a significant product innovation breakthrough that changed the landscape of high-speed rail transportation. Test your knowledge about this critical development in modern transportation history!

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Self-driving capability for unmanned operation
Battery-based self-propulsion system for power outages
Magnetic levitation technology eliminating wheel friction
Hydrogen fuel cell propulsion system for zero emissions