Thanks to members of a discussion group I belong to, I tracked down a fascinating account of one Polish woman's experiences during World War 2. Helena Woloch Antolak worked in forced labor camps in the Soviet Union before making her way across the world and settling, finally, in Scotland. On the way, she and thousands of others spent time in Iran:
After a month, we were sent to the first transit camp in Tehran. There were 107 of us cadets and six instructors. The Persian population received us lovingly. We were given a large hall carpeted with Persian rugs, on which we slept all together as a group with our teaching staff. We were so happy to have left the Soviet Union that we seemed to be breathing in the whole of Persia with every breath we took.
If you, dear readers, know of any other refugees who travelled through Iran during the second world war, please contact me! responses (AT) gmail.com or leave a comment here.