Underneath all the grime is the Rail Head Treatment Train powered by DB Cargo's 66151 and 66155. It is climbing towards Wellington in Somerset.
<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>