How true but funny that. That particular cliche is what I have modelled, bar the clambering cat...! Yes there are many cliches in modelling, whether it be a model railway, static display be it a war scene or a car garage scene! I asked my son what he would like to see/have on the model railway, (as he is only 6 and doesn't understand railway practices), and 4 main points were a turntable, engine shed, coal loader & a station all on a continuous loop. I would pretty much call it "poetic license". Afterall, the majority of railway structures were built 'near enough' to what would realy exist, to make it 'realistic' for him, although as you stated, you would not necessarily have all these items on a through station, but then again yes, the loader needs its own loco & facilities to marshall a train together. Imagine the possibilities...
Cheers, Gary.