The West Somerset Railway's pair of Andrew Barclay shunters. Numbers 578 (blue worksplate on the left) and 579 (red workspalte on the right) were numbers 1 and 2 at the Royal ordnance factory at Puriton 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>