[1] The trains were built jointly by Kinki Sharyo and JR Kyushu (at its Kokura factory).

[3] JR Kyushu plans to install longitudinal seats in all sets by fiscal 2028.

[5] From March 2003, new 10th-batch SaHa 813-400 centre cars were added to standardize the entire fleet as three-car sets.

[5] Two-car set R008 was withdrawn together with R101 and R231 after sustaining damage in a head-on collision in February 2002.

[6] Thirteen 2nd-batch 813-100 series three-car sets (R101 to R113) were delivered to Minami-Fukuoka depot between January 1995 and March 1996.

[5] One set, R228, was transferred to Nōgata depot in October 2001, coinciding with the electrification of the Fukuhoku Yutaka Line.

These new sets feature LED destination indicators, with a redesigned front end.