Is anybody aware of any links for the Signal Box diagrams for Marylebone, Sudbury Hill and Northolt Junction East Signal Boxes as they were in the 1980's?
Having worked on the line for 20 years, as well as working with many of the staff who were on the line in the 1980's, I've only been able to find diagrams for the remainder of boxes along the line.
The only diagrams readily available for Marylebone, Sudbury Hill and Northolt Junction East are all from early in their lives and not representative of their latter period of use. I had heard that Sudbury Hill was an NX panel before it closed, but hadn't seen anything to substantiate this.
Any help or assistance would be gratefully received.