Tokyo restarts the Mizube Line on 17 October with disaster boat Raiden

The Tokyo Metropolitan Government said on 2 October 2026 that the Tokyo Metropolitan Park Association will restart the Tokyo Mizube Line (東京水辺ライン) on Saturday 17 October 2026. The service has been stopped since January 2026. It will run on the Sumida River and nearby water, and it will use the city's new disaster boats, mainly Raiden (らいでん).

The Asakusa–Odaiba cruise (浅草・お台場クルーズ) returns. The former one-day leisure trip is partly changed and renewed as the Sumida River lengthwise cruise (隅田川ゆらり縦断クルーズ). Operating days are mainly Wednesday to Sunday, and the release says weather can change those days. From the restart, and for the time being, a cashless 10 per cent discount applies to the Asakusa–Odaiba cruise.

One-way fares on the Asakusa–Odaiba cruise are ¥600 for an adult and ¥300 for a child between Asakusa and Ryogoku, and ¥2,000 for an adult and ¥1,000 for a child between Asakusa or Ryogoku and Odaiba. A child is from age 1 through elementary school. One preschool child is free with each adult. A child under one year is free.

Raiden carries about 140 people. It is 29.8 metres long and 7.6 metres wide, with a gross tonnage of 73 tons, a speed of about 19 kilometres per hour, and a height above the water of 2.2 metres. It is for carrying supplies and people on the Sumida River and similar rivers. Shiranui (しらぬい) carries about 30 people. It is 17.5 metres long and 5.5 metres wide, with a gross tonnage of 20 tons, a speed of about 19 kilometres per hour, and a height above the water of 2.17 metres. It is for narrow rivers in the Koto interior.

In a disaster, the boats survey rivers and disaster berths and, when the Tokyo disaster headquarters asks, carry supplies and people. In ordinary times they are used for inspections, disaster drills, public information, and the Mizube Line.