More information about the hike in Japanese: https://nishinomiya-kanko.jp/fukuchiyamasen_haisenjiki2019/ (includes a PDF map, also in Japanese)

Information in English: https://travel.gaijinpot.com/takedao-train-tracks-trail/

A Google Maps pin point of where the hike starts: https://goo.gl/maps/qAr3Gyq5W6CT658N8