Who is the Enka Singer on the radio and what is the name of the song

are you talking about the original japanese song playing on the radio in the truck?

if so, its a tuff question, you might want to ask on a japanese music site/forum which has a golden oldie section,  , afterall, we are talking mid 80's for the movie and possibly earlier for the song. that's if it is a released song and not just something that was produced for the movie.

If it's the song playing on the truck radio, that's:

 

"BÅkyÅ Tabigarasu" (望郷旅鴉) by Masao Sen.

Edited August 18, 201510 yr by Masamune

https://m.youtube.com/watch?v=XQd2i5hYkH0 link to the enka.

Thanks for sharing. It's definitely a bit of a rubbish song though, innit?