Insulated three rail system <a href="https://en.wikipedia.org/wiki/model_railway" class="extiw" title="w:model railway">model railway</a>.  Drawn in <a href="https://en.wikipedia.org/wiki/Inkscape" class="extiw" title="w:Inkscape">Inkscape</a> by <a href="https://en.wikipedia.org/wiki/User:Ilmari_Karonen" class="extiw" title="w:User:Ilmari Karonen">User<i><b>:</b></i>Ilmari Karonen</a>.
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Ilmari_Karonen" title="User:Ilmari Karonen">Ilmari Karonen</a> assumed (based on copyright claims).
No machine-readable source provided. Own work assumed (based on copyright claims).