A pair of Southern electric units pass at kensington Olympia on the West London Line. Most services here are dual-voltage units such as 377213 (on the left) as they join the 25kv-electrified West Coast Main Line at Willesden, but 455816 is a 750v only unit and did not work through.
<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>