Zhao Jian (left), professor at School of Economics and Management, Beijing Jiaotong University.

赵坚(左)，教授，北京交通大学经济管理学院。

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Han Baoming (right), professor at School of Traffic and Transportation, Beijing Jiaotong University.

韩宝明(右)，教授，北京交通大学交通运输学院。

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The 21-year-old communications engineering major at Beijing Jiaotong University has never felt so torn.

这位就读于北京交通大学通讯工程专业、21岁的男生从未有过如此撕心裂肺的感觉。

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"I think the bullet train system is not stable and may break down in extreme weather conditions, " said Professor Zhao Jian, a transportation expert with Beijing Jiaotong University.

CNN: STORY HIGHLIGHTS

"In less than a decade, we constructed more high-speed rail lines than what it took Japan and Europe 40 years to build, " said Zhao Jian, an economics professor at Beijing Jiaotong University and one of the country's leading experts on rail transportation.

CNN: China's high-speed trains attract frustrated fliers