Engineers replacing the signals at the west end of platforms 6 and 8 at Temple Meads station in Bristol. The previous signals had been installed in the 1970s and used three-aspect filament bulb signal heads. Their 2017 replacements have multi-colour LED signal heads which can show any of the three colours (red, yellow or green) from a single lamp.
<a href="//commons.wikimedia.org/wiki/User:Geof_Sheppard" title="User:Geof Sheppard">Geof Sheppard</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>