This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionJ21 223 Verkehrstunnel II, Ostportal.jpg
Deutsch: Bei Beginn der Verfüllarbeiten, der Tunnel ist im Bereich der Gleise 12 und 13 zwar schon unterbrochen, weist aber ansonsten auch auf der Ostseite nahezu noch die ursprüngliche Höhe auf.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible licence as the original.