Johnny Rivers' "Last Train to Memphis"

Yester-day I listened to the second disc of a two-disc Johnny Rivers compilation album (Secret Agent Man: The Ultimate Johnny Rivers Anthology).  I noticed the lines "Guess I knew somewhere deep inside / That mystery train would take me for a ride someday" in "Last Train to Memphis," and I'm pretty sure this is a reference to Elvis Presley.  He lived in Memphis, and one of his songs is titled "Mystery Train" (although the phrase itself doesn't appear in the song and Rivers uses it in a different way).