The Gospel blues train ....  is another aspect of the blues; it may be loosely described as a form of blues based on gospel music that has been around since the very beginning of the blues and beyond.

It combines sacred lyrics with a blues flavour, often with a blues guitar accompaniment. Anecdotally, the term Gospel blues was originally used to describe Reverend Gary Davis's style of traditional playing with lyrics conveying a religious message. 

Gary Davis, Thomas Dorsey and Blind Willie Johnson are considered the genre's three dominant performers, the Rev Dorsey being described as the ‘Father of Gospel Blues’ ​Underpinning the work of a myriad of Gospel blues artists, many acknowledge the influence of the works and writings of W C Handy. Many blues musicians even became lay ministers, or even ​ordained clergy, including Reverend Robert Wilkins and Ishman Bracey. 

Sister Rosetta Tharpe - This Train.