That sign apparently means 'do not cross', despite also being put at what look like platform crossings.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/99245765@N00">Loz Pycock</a> from London, UK
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/blahflowers/22346268/">Jenbach Train Station</a>