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
Modified from <a href="//commons.wikimedia.org/w/index.php?title=File:BSicon_HTUNNEL1.svg&amp;action=edit&amp;redlink=1" class="new" title="File:BSicon HTUNNEL1.svg (page does not exist)">BSicon HTUNNEL1.svg</a> <i>by</i> <a href="https://de.wikipedia.org/wiki/Benutzer:Bernina" class="extiw" title="de:Benutzer:Bernina">Bernina</a>