[1] The 6 three-car Hōnanchō branch line sets (81–86) are formed as shown below, with car 3 at the Nakano-Sakaue end.

Internally, LED passenger information displays are used, and the longitudinal seats use piped side partitions.

[2] In July 2022, Tokyo Metro announced that 3-car trains would be withdrawn from the Hōnanchō branch line from 27 August of that year.

[4] Refurbishment included the use of new Toshiba PMSM (permanent magnet synchronous motors), as fitted to the new Chiyoda Line 16000 series trains, offering energy savings of approximately 10%.

The interior was finished in a pale salmon pink colour reminiscent of the original 300 series trains used on the line, and externally, a white "sine wave" design was added to the red bodyside stripes, again reminiscent of the 300 series livery.