|Ebisu, 21 Feb 2017|
|Kannai, 4 Apr 2012|
|Aihara, 21 Aug 2018|
|Clockwise from top left: 205 (Sendai), 209 (Chiba), 211 series (Nagano and Takasaki)|
These facts mean that current rolling stock in those areas (205, 209 and 211 series, which were built in late 1980s or early-90s, will be replaced with the E233 series.
Building new trains takes quite long. When the E233 series were introduced, 83 units were delivered to Keihin-Tohoku and Negishi lines in 29 months, while 28 units to Yokohama line in seven months. The introduction of 49 units of E235 series to Yamanote line took 30 months (excluding one prototype), a little slower because the fleets required several coaches converted from other type. It is difficult to predict how long does it take, but introduction of the new E235 series might take at least three years to be completed.
Reallocation of the E233 series might start much later, as they have to be converted with new traction equipment, new cameras, monitors and computers that allow driver-only operation. They might also be refurbished with an accessible toilet. It is too early to speculate when they will enter into service, but presumably no earlier than 2025. By then, considerable number of redundant intermediate carriages of E233 series will be scrapped.