SSA a cappella with optional train Whistle - Digital Download SKU: MQ.24-95785-E Composed by Keith Montgomery and Ruth E. Dwyer. Octavo. 9 pages. Colla Voce Music - Digital #24-95785-E. Published by Colla Voce Music - Digital (MQ.24-95785-E). A train is chugging into a tunnel where the water drips downMakes a sound like diu diu diuA sound like a coin when it's flipped up and drops to the floor The Fulong Old Caoling Railway Tunnel was opened in 1924 at a length of 2,167 meters (1.34 miles). Because of the tropical climate of Taiwan, the condensation from the ceiling of the tunnel frequently dripped onto the roofs of the trains as they passed through. This folk song is about the drip-drop (“diu diu�) sound that the passengers used to hear as they rode the old locomotives on their journeys to the seaside. The tunnel is now part of the network of Taiwanese cycle paths.