BSicon, tunnel track out of use, from left to bottom
<a href="//commons.wikimedia.org/wiki/User:Maxima_m" title="User:Maxima m">Maxima_m</a>
2012-05-11
Own work based on: <a href="//commons.wikimedia.org/wiki/File:BSicon_KRWr.svg" title="File:BSicon KRWr.svg">BSicon KRWr.svg</a>: <a href="//commons.wikimedia.org/wiki/File:BSicon_KRWr.svg" class="image"><img alt="BSicon KRWr.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/BSicon_KRWr.svg/20px-BSicon_KRWr.svg.png" decoding="async" width="20" height="20" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/BSicon_KRWr.svg/30px-BSicon_KRWr.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/BSicon_KRWr.svg/40px-BSicon_KRWr.svg.png 2x" data-file-width="500" data-file-height="500"></a>