Agger Valley Railway (Aggertalbahn) is the established name of two railway lines in the German state of North Rhine-Westphalia:

• Siegburg–Olpe railway, the historic Agger Valley Railway that is now only open between Overath and Dieringhausen
• Cologne-Kalk–Overath railway, which extended the above-mentioned line in 1910 in order to provide a direct link from Cologne and which then left the valley of the Agger river

This disambiguation page lists articles associated with the title Agger Valley Railway.
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