A modification to Stephenson's Rocket design produced the "Planet" locomotives for the Liverpool and Manchester Railway. This is actually a recreation built from scratch starting in the 1980s. It steams up and chuffs around the yard although I've never seen it do so. Most of the time it is in the Power Hall and whenever I have been it isn't accessible for a close up and personal nosey.
Uploaded to Flickr by ARG_Flickr on 20 December 2018
Photo © ARG_Flickr, 20 December 2018. Licensed for reuse under this Creative Commons licence