The Lüttmoorsiel-Nordstrandischmoor island railway (German: Halligbahn Lüttmoorsiel–Nordstrandischmoor), also called the Loren Railway (Lorenbahn), is a German, 600 mm (1 ft 11+5⁄8 in) narrow gauge island railway through the North Frisian Wadden Sea from Beltringharder Koog on the mainland to the Hallig of Nordstrandischmoor.