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Galaxy (星系, xingxi) is the fastest train service on the [[Seiyo Shinkansen]] in Joban and Sorano. This service stops at only the terminal stations of the line, Lamtsu and Fung Yuen. Along the stretch between Fung Yuen and Tai Hing, the train reaches speeds of 200km/h regularly.

The train stops at fewer stations than the [[Twinkle]] or [[Twilight]] services, using H2-S3 Series 901 Shinkansen rolling stock.