E531 Series Constant Line - S-50

The E531 series (E531系) is an electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) in Japan.^[1] It was introduced by JR East on 9 July 2005 to replace the aging 403 and 415 series EMUs running on the Jōban Line from Ueno Station in Tokyo. The stock is a dual-voltage (1,500 V DC & 20 kV AC) development of the DC-only E231 series suburban EMU design, and can run at speeds of up to 130 km/h (80 mph) in service.^[2]