Khun Tan Tunnel As the train passes through a tunnel, the longest in the country. Construction began in 2450 when the railroad was completed in 2461 by the Royal Siam. With Gen. her Royal Highness. Memoirs of Chaiya Purachatra Department of the Supreme Yothin register as a commander. And a German engineer Emil Eisenstein Hofer supervised the entire construction. It took 11 years, cost a total of 1,362,050 baht.
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