Construction of the Yung Chun Tunnel, at four kilometers, the third longest on the railway, but stretching further than the previous longest in Taiwan, the Tsaolin tunnel near Fulung, was beset with difficulties of almost heartbreaking proportions.
其中以永春隧道的工程最為艱鉅。永春隧道全長四、○二○．五公尺，比過去台灣最長的福隆「草嶺隧道」還要長兩倍，但在十六座隧道中，只不過排名第三。