This British Railways mark 1 brake second corridor (BSK) has been fitted as a control trailer. It is used as such on the Ribble Steam Railway when a single locomotive takes a train through to Strand Road as there is no run round loop there.
<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>