Since first posting about APOC/AIOC on 19th November, a number of people have pointed me to considerably more information about the 2ft 6in gauge and the 3ft gauge railways that served different part of the Company's network in Iran. If the original post of the 19th November was of interest it has now been significantly extended.
The link remains the same so the original more limited text cannot easily be accessed. It has been subsumed in the newer version on the same link. Just for convenience I have repeated the link here:
http://rogerfarnworth.com/2020/11/19...il-company-ltd