Old Caoling Tunnel — The Old Caoling Tunnel spans between Fulong in New Taipei City and Shicheng in Yilan County. It was a key project of the Taiwan Railways Administration's Yilan Line. Upon its opening in 1924, it was the longest railway tunnel in Southeast Asia.

Old Caoling Tunnel. The Old Caoling Tunnel spans between Fulong in New Taipei City and Shicheng in Yilan County. It was a key project of the Taiwan Railways Administration's Yilan Line. Upon its opening in 1924, it was the longest railway tunnel in Southeast Asia. The Old Caoling Tunnel spans between Fulong in New Taipei City and Shicheng in Yilan County. It was a key project of the Taiwan Railways Administration's Yilan Line. Upon its opening in 1924, it was the longest railway tunnel in Southeast Asia, measuring 2,167 meters in length. It bore the crucial responsibility of transportation between Taipei and Yilan. The north and south entrances of the Old Caoling Tunnel are inscribed with the calligraphy "Where White Clouds Fly" and "Controlling the Natural Barrier," respectively, commemorating the arduous engineering feat of that era. The Old Caoling Tunnel was decommissioned after the Taiwan Railways Administration's double-tracking and electrification projects. In 2008, it was reopened as a bicycle path. Address: 新北市貢寮區福隆舊草嶺北口自行車道 Hours: 00:00–23:59 New Taipei