The Blisworth village history web site has an excellent section on the railway including much info and photos of the SMJ. The link's http://www.blisworth.org.uk/images/Rails.htm
. Part 3 links to an article I wrote on my memories of helping out in the main line box in the 1950s and 60s. I also helped (unofficially) at Gayton, Banbury Lane and Heyford.