It's true that, with the exception of die hard railfans, most people don't play steam locomotive sound recordings in their cars or just for leisure around the house. But I must say again that IMO sound recordings are more imaginative and capture the essence of a steam locomotive than video ever will. I can watch a video I make and then I'll isolate the audio and listen to it again (same clip) and it sounds so much better and really puts the person trackside.
Video is great because of its ability to allow you to see where the train is going and what the valve gear is doing etc. but audio lets the person imagine what it must have been like sitting there listening to the engineer wail on the whistle and watching the locomotive roar by, almost slightly nostalgic if you understand my point of view.
