This is the second �Book Of� to describe a Great Western class and it is a cause for rejoicing or lamentation, according to taste, that the detail variation within the class is minimal, at least compared to the devilish Castle brew. The Counties were completed in under two years, remarkably quickly for the Great Western, which rather liked to build its engines over generations. So no �joggled� frames, fluted cylinder casings or a mysterious voyage through two, three, four row superheater boilers and occasionally back again. But we hope one or two revelations � the much-prized �nuggets� � have emerged.