"How Long, How Long Blues" was Carr and Scrapwell's biggest hit. They subsequently recorded six more versions of the song (two of them, unissued at the time), as "How Long, How Long Blues, Part 2", "Part 3", "How Long Has That Evening Train Been Gone", "The New How Long, How Long Blues", etc. There are considerable variations in the lyrics, many of which have since fallen out of use in modern performances. Most versions begin with the lyric "How long, how long, has that evening train been gone?"