[1] Power consumption on these trains is projected to be about 30 percent less than the 10 series counterparts.

Cars 1 and 6 feature leaning pads at the centre of the end section which will increase standing room;[3] these spaces are designated as "Omoiyari Areas".

[4]The design of what would become the 20 series was announced by the Kyoto Municipal Transportation Bureau on 29 March 2019 after a public vote.

The 20 series made its first trips in revenue service on the Karasuma Line on 26 March 2022;[2] in addition, the fleet began service on the Kintetsu Kyoto and Nara lines from 12 and 17 April of that year, respectively.

[10] The 20 series received the 2023 Laurel Prize, presented annually by the Japan Railfan Club.