The Cuckoo Railway (German: Kuckucksbähnel, literally "Little Cuckoo Railway"), in its early days the Elmstein Valley Railway (Elmsteiner Talbahn), is a 12.97 kilometre long branch line in the central Palatine Forest, which runs through the region of Neustadt/Kaiserslautern from Lambrecht to Elmstein. It was built primarily to support the local forestry industry.