The Kuan Yin (Goddess of Mercy) tunnel, 7.74 kilometers long, is now the longest on the island of Taiwan. It takes almost two hours to walk through it, while a train takes 12 minutes to complete the trip.
觀音隧道也是值得一提的，它的長度有七、七四○公尺，是鐵路全線最長的一條隧道，步行大約需要兩個鐘頭，火車也要走個十分鐘左右。