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Resort Shirakami service, this particular set is the Buna. There are 3 in service, and all 3 run a tourist route from Aomori to Akita and back on the Gono line.
Of the 3 sets, two of them use a hybrid DMU trainset called the HB-E300. The third set, Kumagera, is still a refurbished 4-car KiHa 48 DMU.
I've only gotten to ride the Buna, and AFAIK it has the nicest interior. It's mostly furnished with Japanese cedar on the walls and floor, giving it a very warm and bright look.
I do have some pictures of the interior if anybody is interest in seeing it.
