I thought you guys might be interested in maintenance operations with an EMU as a tractor. This made the Tetsudou Fan news feed, although based on the YouTube search results, it's nothing new.
In late November and early December, Joshin Dentetsu used their 200 series EMU DEHA 205 to pull HOKI 801 on maintenance of way work, distributing ballast along the Joshin Line (their only line) between Shimonita and Joshin-Tomioka.
http://railf.jp/news/2015/12/10/163000.html
English Wikipedia article: https://en.wikipedia.org/wiki/J%C5%8Dshin_Dentetsu_J%C5%8Dshin_Line
much older picture of DEHA 205: https://ja.wikipedia.org/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Joshin-cMc205.jpg