[Subbed] Train that supported Tokyo's underground / What is the trigger for retirement?

About this channel
I mainly post railway commentary videos.
While focusing on the Tokyo area, I also upload videos from north to south in Japan.
I have also uploaded a front view video centering on the route taken up in the commentary.
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/ @takagirailway
Narration
CeVIO AI Rikka Koharu (小春六花)
tokyo6.tokyo/k...