This image was kindly supplied by W.R. Mitchell. It is undated, but in the book "Hellifield and the Railway" by W.R. Mitchell & Peter Fox (Castleberg, 1991), it was captioned:
"The station bookstall in 1908."
The photographer / original source is not known and the image has been used by other authors, sometimes without any attribution. From some of these uses, it is clear that the original photograph has a wider field of view.