This series adopted variable-frequency drive motors named "Hitachi HSV-03"; the motor power is 150 kW and installed as 4 motors per car. Power cars are two cars as one pair. The 8100 car establishes the VFD-controller, and the 8200 car establishes a compressor, etc.
Set 8707 was involved in a collision with a track maintenance vehicle in March 2004, at Shonandai Station, and was scrapped in 2006. The set was replaced by a newer Sotetsu 10000 series set. Set 8702 was withdrawn from service on 13 March 2020 for aging reasons and due to the introduction of newly built set 12106 and was scrapped in April of the same year.
Refurbishment
Body
The air conditioners were changed to new freon-based type.
Some diamond-shaped pantographs were changed to single-arm.
From 2008, the livery was changed to a new livery based on that used on the Sotetsu 10000 series.
One Set 8709 Was painted into The Yokohama Navy Blue further sets will be refurbished with new interiors and full led indicator destination
Interior design
Some early formations do not have wheelchair space, so it was added in the 8700 and 8500 cars.
The bench seats were replaced with sculpted longitudinal seats and the seat covers were changed from orange to purple.
Both ends of the seat were attached to white partition board and a curved pole.
A new safety system was established. If no control in one minute, then the emergency brake engages and the train stops. This system is named by Japan "EB".
Refurbished set 8509 in "Yokohama Navy Blue" in September 2020
Interior of refurbished 8000 series longitudinal seating in March 2020
Interior of refurbished 8000 series transverse seating in March 2020
