[7] The sets can be coupled to form a six-car formation at maximum, and can be used on wanman driver only operation services.

[9] On 17 February 2023, JR East announced that the E127-0 series sets would be transferred from Niigata Depot to operate on Nambu Branch Line services.

[15] Twelve 2-car sets were built by Kawasaki Heavy Industries, JR East (Tsuchizaki Factory), and Tokyu Car, and delivered to Matsumoto Depot in November and December 1998 for use on Ōito Line and Shinonoi Line local services.

[8] From 14 March 2015, ten former JR East E127-0 series train sets were transferred to the third-sector railway operating company Echigo Tokimeki Railway for use on the renamed Myoko Haneuma Line, which was a section of the original Shin'etsu Main Line.

[16] As of 1 April 2016[update], Echigo Tokimeki Railway operates ten ET127 series two-car train sets, numbered from V1 to V10.