I had an otherwise rational explanation for it, but I like that. That lets me have some characters yell at each other. 
Wow! I mean - Really? Never?
Is that normal in America? (I'm assuming you're American because of your story, but actually I'd be equally intrigued to know of anywhere where people don't travel on trains at all.)
All I know is that the engineer shovels coal into the hot little door.
And I have just discovered this place, with the stunning locomotives pictured, which is in Duluth, which is not particularly far from where I live. Great success.
That's okay, I can figure out dates just fine on my own. But that's really interesting, because I didn't know that. All I know is that the engineer shovels coal into the hot little door. Unless it's back to the future,and then it's colored sticks of dynamite.
Okay, so I can shovel coal into my steam engine. That works out perfectly. I really wanted someone to have to shovel coal.