If you're expecting another full album, I'm sorry. One track is all you get here. Everything by Amazing Rhythm Aces has been released on CD and can be purchased easily. This song however has not yet seen the digital light of day.
Originally released in 1975, this was the b-side to 'Third Rate Romance'. The song 'Mystery Train' was written by Herman Parker and Sam Phillips (of Sun Records) and it's a nice addition to their 'Stacked Deck' album. Why it was never added as a bonus track to the CD release is beyond me. But here you have it.