150 years of railways anniversary special event. 185 series traversing considerable freight line trackage in southern Kanto (Kanagawa Prefecture). Reservation only, groups of two or more. Would love to take this tour, but probably will sell out in seconds on 4/27.
JR East Press release:
https://www.jreast.co.jp/press/2022/yokohama/20220421_y1.pdf