A popular kid's nursery rhyme was inspired by the Old Caoling Train Trunel. And it is also the first train tunnel to be converted to a bicycle trail in northern Taiwan. Although the tunnel is 2,166 meters long, the air inside is cool and fresh. The decoration of the retro oil lamps and the sound effect of the train makes bikers feel pretty much back to the old age. It is fun to pass through the tunnel and follow the trail biking to the Fulong Beach.