bullet train
US /ˈbʊl.ɪt treɪn/
UK /ˈbʊl.ɪt treɪn/

1.
a high-speed passenger train, especially one operating in Japan
:
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We took the bullet train from Tokyo to Kyoto.
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The new bullet train line will significantly reduce travel time.
a high-speed passenger train, especially one operating in Japan