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Illustrated postcard in watercolor showing a narrow-gauge railway network in the Harz, with red and blue lines connecting stations such as Brocken, Quedlinburg, and Harzgerode, and a steam train at the bottom right. The back indicates the technical features of the network (track gauge 1.000 mm, total length 140.4 km) and mentions the watercolor by Ines Alig-Petsch (2004). A round stamp 'ORIGINAL HSB' is placed at the top right.