I esp. enjoyed laying flat on my back under it, behind that brick-paper skirting, looking upward and listening, when my father ran the trains. I also liked pretending I was "running things". He would let me dump that load of sticks in the dumper-car, and then go and retrieve them for the next re-load.
That's a good reminder - when my grandson appears to be laying around just watching, it's important to remember he's probably day dreaming and imagining all kinds of things ... or just simply enjoying the sound! I know I do