Locomotive testing plant. GWR Swindon Works.
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Locomotive appears to be an early <a href="https://en.wikipedia.org/wiki/GWR_2900_Class" class="extiw" title="en:GWR 2900 Class">' <i>Saint</i> ' class</a>, in the period when these were taper-boilered 4-4-2 atlantics (later rebuilt as 4-6-0). The number could be either <i>180</i> or <i>190</i>.
<a href="https://en.wikisource.org/wiki/Author:E._L._Ahrons" class="extiw" title="s:Author:E. L. Ahrons">E. L. Ahrons</a>
<i>Original:</i> Steam Locomotive Construction and Maintenance p. 114, Fig. 45.<br><i>Scan:</i> Internet Archive – <a rel="nofollow" class="external free" href="https://archive.org/details/steamlocomotivec00ahrorich">https://archive.org/details/steamlocomotivec00ahrorich</a>