choice. This image is a derivative work of the following images: File:U-Bahn_Wien.png licensed with Cc-by-sa-3.0-migrated, GFDL 2009-08-29T15:44:37Z My
DescriptionU-BahnWien.png U-Bahn-Netz Wien Date 4 October 2013 Source Own work Author User:My Friend Permission (Reusing this file) I, the copyright holder