Pha Sadet is a historically significant cliff, marking the spot where King Chulalongkorn (Rama V) and Queen Saovabha Phongsri visited in 1895 to oversee the rock blasting process for the construction of the Kaeng Khoi-Muak Lek railway line. The cliff features the royal initials "Chon Por Ror" and "Sor Por" inscribed alongside the year of their visit, serving as a vital record for future generations to remember the challenges faced in establishing Thailand's transportation foundation. The surrounding landscape remains solemn and is enveloped by the peaceful nature along the tracks, making this site a meaningful stopover filled with valuable stories and a symbol of the immense perseverance shown by our ancestors.