Background for images, raster 10 x 10 pixels. To make checking of files from <a href="//commons.wikimedia.org/w/index.php?title=Category:Icons_for_railway_descriptions&amp;action=edit&amp;redlink=1" class="new" title="Category:Icons for railway descriptions (page does not exist)">Category:Icons for railway descriptions</a> etc. easier.
<a href="//commons.wikimedia.org/wiki/User:Erik_Baas" title="User:Erik Baas">Erik Baas</a>
Own work by uploader, based on <a href="//commons.wikimedia.org/wiki/File:Checker-16x16.png" title="File:Checker-16x16.png">Image:Checker-16x16.png</a>