In the past few years, modellers of UK industrial railways have been treated to several ready-to-run industrial locomotives in 4mm:1ft scale/OO gauge, starting with Hornby's rendition of the Sentinel four-wheel diesel-hydraulic. Since then, we have had diesel and steam engines from other manufacturers, with more in the pipeline, from the likes of Dapol and Rapido. Of all that have appeared so far, the most versatile for modification is the Andrew Barclay 0-4-0ST, from Hattons.
For those more used to main line railways and their locomotive types, the classification of industrial locomotives must seem rather strange inasmuch as there were usually no specific classes of steam locomotives, certainly nothing in the way, for instance, an A4 denotes an LNER streamlined Pacific, or a Q6 a heavy freight 0-8-0 – both recognisable because all their classmates looked near identical to one another. The nearest thing to a classification system in the industrial
