The <a href="https://en.wikipedia.org/wiki/British_Rail" class="extiw" title="w:British Rail">British Rail</a> 'double arrow' logo, in white with a <i>Flame Red</i> background. <i>Flame Red</i> is based on the definition in British Standard BS381C, where it is identified by the number 593 and the names <i>Rail Red</i> and <i>Azo Orange</i>. It is considered <a rel="nofollow" class="external text" href="https://twitter.com/_doublearrow/status/743897730720931842">notoriously difficult</a> to reproduce accurately on computer screens.
<ul><li>Double Arrow design - <a href="https://en.wikipedia.org/wiki/British_Rail_Research_Unit" class="extiw" title="w:British Rail Research Unit">British Rail Design Research Unit</a> staff member <a rel="nofollow" class="external text" href="http://www.doublearrow.co.uk/background.htm">Gerry Barney</a>.</li>
<li>This file: <a href="//commons.wikimedia.org/w/index.php?title=User:Tobyclifton&amp;action=edit&amp;redlink=1" class="new" title="User:Tobyclifton (page does not exist)">Tobyclifton</a></li></ul>
<a href="https://en.wikipedia.org/wiki/Tobyclifton" class="extiw" title="w:Tobyclifton">Tobyclifton</a> redrew it according to the <a href="https://en.wikipedia.org/wiki/British_Rail_Corporate_Identity_Manual" class="extiw" title="w:British Rail Corporate Identity Manual">British Rail Corporate Identity Manual</a>.