Hello Viv
I discovered this forum when looking for info. on Sandy Lane. The family moved into a 'maisonette' in Sandy Lane in either 1949 or 1950. I would have been about 7 years old, and your photo brought back a memory from that time, and it's very possible that it relates to the site of your photograph.
One day, when exploring the environs of my new home I came upon a high wooden fence adjacent to a railway bridge. There was a door in this fence and when I pushed it, to my surprise, it opened. It opened onto a scene that was both exciting and scary. I entered a large,dark, damp space underneath the ironwork of the railway, The sound of dripping water echoed through the shadows and I saw, just ahead of me, a parapet almost as high as me. By standing on tiptoe and straining every inch of my 7 year old height, I was able to peer down a fearful distance to the black water of … a canal lock! I had discovered a place where the trains rumbled over the road while a canal tunnelled beneath. An awesome and magical place for a very young boy.
I ran home but told nobody what I had found. Mom and dad would have been very cross and probably banned me from 'exploring' and I wasn't going to tell other boys – then it wouldn't have been 'my' secret place any longer, would it?