"Pearl" Kerr Stuart Saddle Tank locomotive.

"PEARL" is an 0-4-2 saddle tank based on the locomotives built by Kerr Stuart of Stoke on Trent during the 1920's. Three classes of locomotive of the type were built,  "Wren", "Thames" and "Tattoo." Pearl being an example of the latter class. 

Suited to all kinds of work, these durable little locos were used on many industrial lines in Britain and exported to all corners of the globe. The well known loco "Edward Thomas" on the Talyllyn is a Kerr Stuart Tattoo class loco, although differing from Pearl in having a full cab and more rounded saddle tank variation in style being typical of narrow gauge.

As a consequence of these locos being called upon to work in many differing conditions and terrain, they were available in gauges ranging from 18" to standard gauge. It has been possible to utilise this to produce Pearl in both 5" and 7¼" gauges; the same loco to the same scale but representing different full size gauges.