During the twenty years in which Britain's nationalized railway operated mainline steam locomotives, a vast array of individual designs complemented the British Railways 'Standard' machines, built up to 1960. Such was the variety of motive power to be seen on the network that this 'early' period of BR's existence has proved to be the most enduring amongst enthusiasts and modelers. The ready-to-run market has reflected this popularity in terms of models and liveries available off-the-shelf. Despite constantly rising levels of detail, finish and performance, r-t-r models can never cater for every variation in components, equipment or livery that invariably arose within large and long-lived fleets. Nor can they offer particular running numbers and names to satisfy every customer, while older products may also require work to bring them up to the standard of contemporary offerings. Therefore, being able to change factory-applied decals, add period or individual locomotive-specific details, modify a livery or create an authentic weathered finish can prove vital to achieving a heightened sense of realism and individuality within our traction fleets.