I was able to connect with a HAM from Cixi today. I had heard rumors that there were no train enthusiasts in Cixi, but could this mean that there are no HAMs in Yau?
I found a train enthusiast from Cixi on Bilibili, and I was also able to locate an old locomotive belonging to the Yuxi Railway using his photos. However, I haven't been able to contact HAM from Yao yet.

