Whilst sorting through a file of railway related documents and drawings, I found a folded piece of A3 paper, which turned out to be a plan of the site. In about 1999 I had access to large scale OS maps of Corby which must, looking at this small extract, have dated from the 1970s. Sadly I didn't have the foresight to copy the whole lot, but I did copy the section covering Pen Green workshops. I had completely forgotten that I had done this, so it came as a pleasant surprise.

There is no connection with the exchange sidings to the south, though I suspect that it would have been connected at some point. There is a line running around the east side of the site as I have envisaged for my layout, so other than the extra couple of sidings at the works (which, looking at the site on the ground, may have existed before the map was made) it should be fairly true to the prototype - almost by accident as I was not previously aware of the east line.

So, I now have drawings and pictures of the buildings and a site plan. Now to get something on paper.