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The Nagold Valley Railway (German: ''Nagoldtalbahn'') is a railway line in the northern part of the Black Forest in Germany which links Pforzheim with Horb am Neckar and, for most of its route, follows the valley of the River Nagold. Trains on the non-electrified, single-tracked main line are operated by ''DB Regionalverkehr Alb-Bodensee''. Since 2005, the line has been designated and operated as a ''Kulturbahn'' ("cultural line"), together with the Upper Neckar Railway from Horb to Tübingen. ==Topography== The Nagold Valley Railway runs along the northeastern edge of the Black Forest. Leaving Pforzheim, it does not initially follow the River Nagold, but instead runs together with the Enz Valley Railway along the Enz, before diverging after 3 km in Brötzingen and running through a tunnel to the Nagold Valley. It follows the river to the town of Nagold, passing through several tunnels which shorten its route appreciably, so that the line between Calw and Nagold is several kilometres shorter than the road. South of Nagold, the Black Forest gives way to the Gäu plateau. The railway leaves the floor of the Nagold valley south of Wildberg, after passing through the Bettenberg tunnel, and over the course of 13 km climbs the sides of the valleys of the Nagold and its tributary the Steinach to an altitude of 100 m. South of Schietingen it runs through the Hochdorf Tunnel to the level of the upper Gäu and at the Hochdorf station reaches its highest point of elevation, 511 m. From there the Nagold Valley Railway and the Eutingen–Freudenstadt Gäubahn run together for a few kilometers in a wide curve around the settlement of Eutingen im Gäu, before the Nagold Valley line merges with the Stuttgart–Singen Gäubahn at the position of the former Eutingen station (operated until 1933). The combined line then runs into the Eutingen Valley, leaving the Gäu and descending 100 m to Horb in the Neckar Valley. The topography of the Black Forest posed many engineering challenges in constructing the line, which has a total of 21 bridges longer than 20 m, most of which cross the Nagold or the road running parallel to it, Bundesstraße 463; and also 10 tunnels, of which the Hochdorf Tunnel between Gündringen und Hochdorf is both the longest and the highest in altitude. The Hochdorf Tunnel was the longest tunnel in the Royal Württemberg State Railways system, far exceeding the second longest, the Weinsberg Tunnel.〔Albert Mühl and Kurt Seidel, ''Die Württembergischen Staatseisenbahnen'', Stuttgart: Theiss, 1980, ISBN 3-8062-0249-4, p. 264 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nagold Valley Railway」の詳細全文を読む スポンサード リンク
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