Senzan Line
From 1 July 1967, 455 series trains were introduced on new "Bandai" express services operating on the Banetsu West Line. From 1 October 1968, with the completion of AC electrification of the route between and Sendai via the Ou Main Line and Senzan Line, 455 series trains were introduced on "Zaō" services operating between Ueno and Yamagata.