A pic of "Hatsukari" when I travelled around Tohoku region with some friends in 1977.
I was on an express train "Inawashiro" which connected Aidu-Wakamatsu and Sendai. "Inawashiro" was exactly an express train but it stopped all stations throughout Fukushima from Aidu-Wakamatsu. Another express train "Matsushima" overtook the "Inawashiro" somewhere around Motomiya or Nihonmatsu. Then this "Hatsukari" overtook the "Inawashiro" maybe at Shiraishi if I remember correctly.