Bullet Train (Shinkansen)
Speed and efficiency rise to the top of any word cloud describing the Japanese railway network. The Shinkansen, or bullet trains, are at the heart of this praise. The surprising comfort and ability of the Shinkansen to whisk travelers from place-to-place for a reasonable price, put them at the top of any tourists' list while traveling within Japan.
Furthermore, you can catch some pretty spectacular views of the Japanese countryside (most notably Mt. Fuji) while you enjoy this experience of being speedily transported in comfort from Tokyo to Kyoto to Osaka to Hiroshima.