Yokohama Municipal Subway 4000 series

The Yokohama Municipal Subway 4000 series (横浜市交通局4000形) is a metro electric multiple unit (EMU) train type operated by the Yokohama City Transportation Bureau on the Yokohama Municipal Subway Blue Line in Japan since 2022.

Formation
The sets have four powered cars and two leading trailer cars, and are formed as follows.

Interior
Longitudinal bucket seating is used throughout.

Technical details
Construction is of stainless steel. Cars are 18 m long (leading cars are 54 cm longer ), 2,760 mm wide, and approximately 3.5 m tall. The trains use a VVVF traction control system that allows for full regenerative braking. The trains have a maximum design speed of 90 km/h but are limited to 80 km/h during operation.

History
On 13 December 2021, the Yokohama Municipal Subway announced that new trainsets would be purchased for the Blue Line, replacing the oldest 3000A series trainsets dating back to 1992.

The order was originally made in 2018 for a new batch of 3000V series trainsets but that plan was abandoned in favour of newer 4000 series cars.

, five trainsets (30 vehicles) are to be commissioned in 2022 while the remaining three sets (18 vehicles) will enter service in 2023.

The first trainset entered service on 2 May 2022.