My layout is run to represent both a time and place, and as such the vast majority of the stock is representative of what actually would have been seen there. (Time and place carefully chosen to enable it to legitimately have one of the most varied steam loco and stock collections possible, and most of the BR early diesel electrics, amounting to over sixty locomotive classes.)
Then there are the whole trains that represent loco and stock that operated over the location at other times, and HO models of trains that operated elsewhere in the world. They come out for fun.
Then there are the whole trains that represent loco and stock that operated over the location at other times, and HO models of trains that operated elsewhere in the world. They come out for fun.