I tried to make as study.
The railroad song(鉄道唱歌), is a song about the railway that has been lyricist in the Meiji era. It consists of all Vol. 6 No. 374.
It takes to sing verse about 30 seconds.
Therefore, sing all 374 verse of when it takes 1 hour and 10 minutes or more.
Very interesting. Don't think I've heard this kinda music before.
Very interesting! There is no English version for the Wikipedia article. I guess it is a folk song!