This image is from a painting by George Heiron reproduced in an article on “The Engines that Won the War” in The Railway Magazine, July 2014. The caption reads:
A surviving British war hero: WD No. 307 was built by North British in 1940 and was intended for mainland Europe. However, the fall of France that year saw it kept in the UK and used as LMS No. 8233. The WD reclaimed it in 1941 and shipped it to Persia, where it … worked supply trains into Russia. After service there (during which time it was derailed by a camel!) it returned to the UK … It survived until the end of BR steam in August 1968 and was then saved for preservation on the Severn Valley Railway.
Derailed by a camel indeed! And we aren’t even told the fate of the camel.