[2] In 1992, the original pantographs were replaced with the same S-PS58 type pantographs also used on the JR Shikoku 7000 series EMUs to ensure adequate clearance through tunnels on newly electrified sections of the Yosan Line.

These sets were repainted with their original JNR-style magenta bodyside stripes.

[5] From 2016, the entire fleet of 19 two-car trainsets is scheduled to undergo refurbishment, and at the same time reclassified "7200 series".

Refurbishment includes replacement of the DC motors with 140 kW AC motors and VVVF control, new side windows, new "efWing" CFRP bogies (S-DT67ef motor bogies and S-TR67ef trailer bogies), and a new livery based on the original style with a thin green line added to the magenta bodyside stripe.

[6] The first trainset to be treated, set 3, was outshopped from JR Shikoku's Tadotsu Works in February 2016,[7] and entered service from 13 June 2016.