A NER box situated on the Whitby-Rillington Junction line, with a branch to Middlesbrough.
When this picture was taken the box was functioning as a ground frame to allow access from the Whitby-Middlesbrough line to the North Yorkshire Moors Railway.
The diagram, from when the box was open. This diagram was to be found latterly in the tea room on Grosmont (NYMR) station.