@TheSodorStories so um I know I'm extremely late, but WWII could be a ok one. Actually, I haven't seen a lot of stories talking about the diesels taking the places of the steam locomotives. I think that can be a good one to elaborate from. Though I noticed that your stories tend to be a little more, let's say, individual? More like episodes instead of a continuous event, so it might not fit well for your style.