It was an 0-2-2WT locomotive and is now regarded as the first tank engine.[1] It had a unique design of boiler and a number of other novel design features (perhaps explaining the choice of name). Unfortunately, several of the major components had significant design weaknesses which ultimately resulted in its failure at the Trials.
^"Historical Tank-Engines". The Railway Engineer. Vol. XIV, no. 10. October 1893. pp. 313–316 – via Google Books.