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}} The Siegburg–Olpe railway or Agger Valley Railway ((ドイツ語:Bahnstrecke Siegburg–Olpe) or ''Aggertalbahn'') is a single-tracked, non-electrified branch line in the German state of North Rhine-Westphalia. Part of a direct link from Cologne, only the section from Overath to Dieringhausen is still in operation. The section of line from Siegburg to Overath and from Dieringhausen to Olpe are closed. The line is named after the River Agger, which it follows for a long way and crosses several times. == Significance == Although the line as always been considered by its operator as a branch line, it is central to the railway network of the Oberbergisches Land and it has been called a “secret” main line.〔Sascha Koch, Horst Kowalski et al. (2005), p. 10.〕 Like the other lines in the region it primarily served local industry (mainly the textile and metal industries). Unlike, for example, the Wiehl Valley Railway (''Wiehltalbahn''), the line was not primary built to serve the quarry industry, it also used to connect to company sidings and to other branch lines. Passenger played only a secondary role from the beginning.〔Sascha Koch, Horst Kowalski et al (2005), p. 11 f.〕 Despite the fears of critics, the line was initially very profitable: the line from Siegburg to Derschlag was the most profitable branch line between Cologne and Kassel. This section was opened in 1896 while its continuation to Bergneustadt was still being planned. Accounts from 1892/1893 show that it had revenues of 21,000 marks per kilometre. For comparison, the Wisser Valley Railway (''Wissertalbahn'') between Wissen and Morsbach generated only 6,800 marks per km.〔Sascha Koch, Horst Kowalski et al (2005), p. 77.〕 The following standard gauge branch lines branched from the Agger Valley Railway: *the Cologne–Overath railway as a direct connection from the Oberbergisch district to Cologne *the Wiehl Valley Railway to Osberghausen *the Volme Valley Railway (''Volmetalbahn'') to Dieringhausen *the tramlines and freight sidings of the Gummersbach Light Railway (''Gummersbacher Kleinbahnen'') to Niedersessmar and Derschlag *the Finnentrop–Freudenberg railway to Olpe. Up to the 1950s, there was also in Engelskirchen a loading bay of the metre-gauge Leppe Valley Railway (''Leppetalbahn'') to Marienheide and a very small narrow-gauge railway to Drolshagen. In addition, during the two world wars and the occupation of the Ruhr,〔Sascha Koch, Horst Kowalski et al (2005), p. 84f.〕 the line together with the Wiehl Valley Railway was historically significant as a diversion route for coal trains〔Sascha Koch, Horst Kowalski et al (2005) p. 21.〕 and other important traffic. In the 1970s it was used as a scenic railway. Until the 1970s there were many sidings serving industrial companies such as ''Delta'' in Derschlag and ''Dörrenberg Edelstahl'' in Ründeroth. The traffic on the now closed Siegburg–Overath section usually had only local significance. Following the opening of the Cologne–Overath railway, trains ran from Cologne to Dieringhausen or even Hagen. The timetable only included a service over the whole of the original line from Siegburg to Olpe until the Second World War.〔Sascha Koch, Horst Kowalski et al (2005), p. 23 ff.〕 There were also mostly only local passenger trains on the section between Dieringhausen and Olpe. There were few express trains in the timetable which ran to points outside the area. This was also one of the reasons for the closure of passenger services, partly caused by poor design, including the lack of a direct connection from Olpe to Gummersbach except via an awkward set of points in the Dieringhausen district. 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「Siegburg–Olpe railway」の詳細全文を読む スポンサード リンク
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