南武線
In 2017, six-car Itsukaichi Line/Ōme Line set Ao670 was modified and renumbered at Omiya Works to become E233-8500 series set N36 for use on the Nambu Line alongside the fleet of E233-8000 series sets and replacing the last remaining 209 series EMU still in use there. In addition to receiving the Nambu Line livery carried by the E233-8000 series fleet, modifications included adding a WiMAX antenna and replacing the original 15-inch LCD passenger display screens with 17-inch screens. Set N36 entered service on the Nambu Line on 15 March 2017.