These videos are terrific. I've been to Japan four times and have found the rail system fascinating. My favourite journey was Niigata to Yonezawa. Slow train through beautiful snow covered country. My first trip was in three parts. Narita to Ueno, Ueno to Toride, and then Toride to Kokinu.
They used to run really old 105 Series (ex 103 Series) train sets between Wakayama and Oji. I think everyone is kind of thankful they were replaced by the new 227-1000 train sets that support IC card ticketing.