Regular Steam Days readers will know that engine sheds are generally at the heart of our research, but while the infrastructure of these locations, and indeed their changing allocation, are centre stage, we like to make sure that there is more. That ‘more’ is really an understanding of why the engine shed in question was needed in the first place, so, for example, what were its key operations? Sometimes this can be offered as sample passenger timetables, but for sheds such as Frodingham there was very little in terms of passenger work, and indeed, that will be covered more fully when in due course we consider the shed’s limited 4-4-0 allocation as part of a class-by-class follow up, so here we concentrate on a deep dive into the goods/heavy freight…