Smoke Train Battery Operated Electric Train Set, 13 Pieces with Lights and Sound, Express Locomotive with Track13 Piece Set: This typically includes the locomotive (engine), 2 3 passenger or cargo cars, and a set of curved and or straight track pieces to form a circular or oval layout. "Smoking" Effect: This is one of the main attractions! The engine often emits realistic, non toxic steam or smoke (usually created by adding a few drops of water or special fluid into a designated spot on the chimney). Lights and Sound: The locomotive usually features a working