Part 5 completes this series, with the Caprottis and the final LMS and BR-built locomotives. As we’ve discovered, the Black 5s were not all the same – far from it. The story has unfolded in an approximate chronological sequence, which makes sense – at least more sense than other approaches. So the books are arranged in the order in which the locomotives were introduced, with an added twist that particularly in matters such as boilers and tenders there is a certain amount of back and forward cross-referencing. Some details are covered in more depth in the earlier books and only summarised in the later parts.