Which high-speed train system first broke the commercial service speed barrier of 300 km/h (186 mph) in regular passenger operations?

Test your knowledge about one of the most significant product innovations in transportation history! High-speed rail technology has transformed how we travel between major cities around the world. Different countries have pioneered unique approaches to this technology, with varying speeds, designs, and implementation strategies. This question explores a pivotal moment in high-speed rail development that changed the industry forever.

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