Which groundbreaking product design feature was NOT part of Japan's original 1964 Shinkansen bullet train that revolutionized high-speed rail transportation?

High-speed rail transformed transportation worldwide with sleek designs prioritizing aerodynamics and efficiency. Japan's pioneering Shinkansen (bullet train) system represented a quantum leap in rail technology when introduced. Test your knowledge about this iconic product design that influenced transportation systems globally and continues to evolve with cutting-edge innovations in speed, safety, and sustainability.

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Magnetic levitation (maglev) technology
Aerodynamic nose design to reduce sonic booms when entering tunnels
Dedicated high-speed tracks separate from conventional rail lines
Automatic train control system for improved safety at high speeds