Recently, reading old copies of BackTrack magazine, I came across an article which included memories from an Army engineer of time spent in Iran in the early 1940s and in the same issue of the magazine a short note about the involvement of the GWR in Iran.
These seemed to be fitting items for an addendum to this series of articles. This is the link to the new post.
https://rogerfarnworth.com/2021/09/1...an-an-addendum