Old Caoling Tunnel Introduction
The Old Caoling Tunnel spans between Fulong, New Taipei, and Shicheng, Yilan, and is a key engineering project of the Taiwan Railways Yilan Line. When it was opened in 1924, it was the longest railway tunnel in Southeast Asia, measuring 2,167 meters in length, serving the important transportation link between Taipei and Yilan. At the north and south entrances of the Old Caoling Tunnel, there are two calligraphic inscriptions: "Where White Clouds Fly" and "Guarding the Heavenly Pass," commemorating the arduous construction work of that time. After the dual-tracking and electrification of the Taiwan Railways, the Old Caoling Tunnel was decommissioned, but it reopened in 2008 as a bicycle path.
