back in the 70s(?), NZ Railways did a big advertising campaign and a
song was released on a special edition 45. It was sung to the tune of
"Rawhide" and lyrics were "Rolling rolling rolling, we keep these
wheels a' rolling, right across the country, Railfreight. Muscles big
and bulging, we keep these freight trains rolling... etc"
I don't remember who sang it - could have been Eddie Low or someone
like that.
If anyone has a copy please contact me.