I have recently acquired a number of photos of the SMJ taken during the period late 1950's to early 1960's.
Fortunately most have full details provided, but I am left with four which I cannot identify.
I can rule out the Towcester to Cockley Brake section as the photographer unfortunately only got there after the track had been lifted. Also most - but not all - of the pics on the Towcester to Ravenstone section were taken when it was disused, with the track in poor and weedy condition, so that is less likely but not impossible.
I am hopeful that someone out there in our Society will recognise the locations - I will add the pics in the photo section with a few comments that may assist - thanks for your help!