I was given this book "Happy as a Sandboy" yesterday. It was available from the NRM in 1990 - some of you may have it? It gives the history and lots of coloured pictures of posters from the various railway companies - the earliest post was dated in the 1890's. I have shown the book (1st picture) plus a couple of pictures from the book.
IMG_1156 by
Barry Clayton, on Flickr
IMG_1158 by
Barry Clayton, on Flickr
IMG_1159 by
Barry Clayton, on Flickr