The Borneo Co built a logging tramway over the Khun Tan ridge around Year 1910. Its purpose was to move logs from Chai Prakan to Chiang Dao so they could then be floated down to Bangkok on the Ping: t ...
Just for record purposes, there was another tower on Khun Tan:
http://lanna-ww2.com/pages/z01000/y0100a-images/picbig-140227101944a.jpg
This photo appears in the Chiang Mai University (CMU) webpage: ...