Now this rings a faint and blurred bell of some Corries song by this tune -- I don't recall the title they gave it, just some fragments of the lyrics:

"...he was playin' games for money/In the Snakes and Ladders school..."

and a reference at the end of a verse to:

"...the Ballachuilish ferry."

My father in law tells me he once rode that ferry; he says it takes five minutes to make the Ballachuilish run.