A song full of puns.

I heard Casey Jones called Casey's Last Ride in my youth. 'Ride' to an Irish person is a jokey term for sexual intercourse, that's one of the puns, drinking a pint of bitter(ness) is another, and so on.

If you like, it's a visit to the psychic underground, on his way to Hades; Casey has married (or stayed married to) the wrong woman and his former lover also still longs for him.

The mixture of Anglo and American usages may be Kristophersen's tin ear for exact dialogue; "to make a body smile" sounds Cockney to me, but perhaps not; following arrows through the subway to the turnstile sounds British, but perhaps not.