According to Chinese engineers, this is a maglev train, for which special tunnels will be developed, from which air will be pumped out. According to preliminary calculations, this will minimize resistance and achieve unreal speeds.
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For general development, we note that today the fastest maglev train is the Japanese JR-Maglev, reaching 581 km/h. But more than 80% of the energy spent goes precisely to overcoming air resistance. This suggests that in theory the Chinese can indeed create an "intergalactic" train.