The 115 series EMU was introduced by Japan National Railways. Today (Dec 2019) only JR West and JR East operate them (JR East has a few units operated by its Niigata Branch) and JR West a fairly large number operated by their Hiroshima and Okayama Branches) however both companies are in the process of replacing them with more modern trains (JR East with E129s and JR West with 227s). This video was taken at Okayama Station on 20-Dec-2019
AloJapan.com