Icon for railway diagram, see <a href="https://en.wikipedia.org/wiki/Wikipedia:Route_diagram_template" class="extiw" title="w:Wikipedia:Route diagram template">Route diagram template</a>. Horizontal tunnel.
<i><a href="//commons.wikimedia.org/wiki/User:Mattbuck" title="User:Mattbuck">mattbuck</a></i>
2009-05-07
Own work based on: <a href="//commons.wikimedia.org/wiki/File:BSicon_exTUNNEL2.svg" title="File:BSicon exTUNNEL2.svg">BSicon exTUNNEL2.svg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:Seo75" title="User:Seo75">Seo75</a>