On Remembrance Sunday (November 9) 2014 the fleet of InterCity 125s operated by First Great Western were all sporting remembrance poppies.  This is 43125 at Exeter St Davids on its way from London Paddington to Truro (not its usual terminus but the line onwards to Penzance was closed due to engineering work at Hayle).
<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>