Which Shinkansen is the longest?

The Tohoku Shinkansen (?????) is a Japanese high-speed Shinkansen rail line, connecting Tokyo with Aomori in Aomori Prefecture in a route length of 674.9 km (419.4 mi), making it Japan's longest Shinkansen line.



The longest Shinkansen line in Japan is the Tohoku Shinkansen, which covers a total distance of approximately 674.9 kilometers (419 miles). It runs from Tokyo Station all the way to Shin-Aomori Station at the northern tip of Honshu island. The line serves as a vital artery connecting the capital with major northern cities like Sendai and Morioka. Travelers can experience the world-famous "Hayabusa" train on this route, which reaches speeds of up to 320 km/h (200 mph), making it one of the fastest scheduled trains in the world. Interestingly, while the Tokaido Shinkansen (Tokyo to Osaka) is much busier and more famous, it is actually shorter at 515 km. In 2026, the Tohoku Shinkansen remains a favorite for tourists using the JR Pass to escape the heat of the central cities for the cooler, lush landscapes and hot spring resorts of the northern Tohoku region.

The longest Shinkansen line by total route length is the Tōkaidō-Sanyō Shinkansen when considered as a continuous corridor.

Here’s a breakdown:

1. Tōkaidō Shinkansen + Sanyō Shinkansen

  • Tōkaidō Shinkansen: Tokyo ↔ Shin-Osaka (552.6 km)
  • Sanyō Shinkansen: Shin-Osaka ↔ Hakata (644.0 km)
  • Combined length: 1,196.6 km

This is the longest continuous high-speed rail corridor in Japan, operated jointly by JR Central and JR West. Many through services (like the famous Nozomi trains) run from Tokyo all the way to Hakata (Fukuoka) without passengers changing trains, making it effectively the longest Shinkansen route in daily operation.

2. Longest individual Shinkansen line under one name

The Sanyō Shankansen (Shin-Osaka to Hakata, 644 km) is the longest single Shinkansen line under one name.

3. Longest by track length including extensions

If considering extensions beyond the main trunk: - Kyushu Shinkansen (Kagoshima Route) connects to the Sanyō Shinkansen via Hakata, extending further to Kagoshima-Chūō. - However, the through journey from Tokyo to Kagoshima-Chūō (via Tōkaidō, Sanyō, and Kyushu Shinkansen) covers about 1,320 km, but involves separately named lines.

Summary answer:
The Tōkaidō-Sanyō Shinkansen corridor (Tokyo ↔ Hakata, 1,196.6 km) is the longest Shinkansen route in terms of continuous high-speed service under unified operations. The Sanyō Shinkansen alone is the longest individually named line at 644 km.

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