721 series

The 721 series (721系) is an AC electric multiple unit (EMU) operated by Hokkaido Railway Company (JR Hokkaido) on Sapporo area suburban services in Hokkaido, Japan since 1988.

Design
The trains were built jointly by Hitachi, JR Hokkaido (Naebo Factory), Kawasaki Heavy Industries, and Tokyu Car (Yokohama).

Fleet
As of 1 April 2012, the fleet consists of 135 vehicles, formed as 23 3-car sets and 11 6-car sets.

Variants

 * 721-0 series
 * 721-1000 series
 * 721-2000 series
 * 721-3000 series
 * 721-4000 series
 * 721-5000 series

Withdrawal
Withdrawals of the 721 series commenced in 2023 with 721-3000 series set F-3016 being scrapped as of August. This continued the following year with sets F-4 and F-3015 being sent to Naebo for scrapping in April 2024.

In April 2024, JR Hokkaido announced that it will replace the 721 series with additional 733 series trains on Chitose Line Airport services.