The is an electric multiple unit (EMU) commuter train type operated by the third-sector railway operator Tokyo Waterfront Area Rapid Transit (TWR) since 2025. A total of eight 10-car sets are to be built to replace the fleet of 70-000 series sets used on the Rinkai Line since its opening in 1996.
Design Based on the JR East E233 series design, the 71000 series is built by Japan Transport Engineering Company (J-TREC) as part of its "Sustina S24 Series" family of 20-meter-long four-door cars. The type uses a wide-body design to reduce congestion.
Formation Sets are based at Yashio Depot and are formed as follows with six motored ("M") cars and four non-powered trailer ("T") cars.
Car No. 10 9 8 7 6 5 4 3 2 1 Designation Tc M1 M1' T2 M3 M3' T1 M2 M2' Tc' Numbering 71-x10 71-x09 71-x08 71-x07 71-x06 71-x05 71-x04 71-x03 71-x02 71-x01 Weight (t) 31.1 32.3 33.1 29.1 32.2 30.2 29.4 32.9 33.1 31.3 Capacity (total/seated) 140/39 158/51 158/51 158/51 158/51 158/51 158/51 158/51 158/51 140/39 Cars 6 and 9 have one pantograph, and car 3 has two. All cars have a wheelchair space.
Interior Passenger accommodation consists of longitudinal seating throughout.
History Details of the trains were announced by TWR in November 2023. A total of eight 10-car sets are due to be in service by fiscal 2027.
The first train was delivered from the J-TREC plant in Niitsu in November 2024. Set Z12 followed suit in June 2025.
The 71-000 series fleet entered service on the Rinkai, Saikyō and Kawagoe lines from 1 October 2025.
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