Nothing extravagant, or outlandish, or totally unrealistic.
At-a-glance, you'd expect a movie about trains to be kind-of lame, or boring, but I was really into this movie, pretty much from start to finish.
They add a couple bits of personal side story, to the two main characters, and generally I would find that to be tedious, pandering, wasteful, etc, but they didn't focus on it too long, or in a disingenuous way.
They briefly touched on it, a few times, throughout the film, and it was surprisingly well done.
Who would have thought that a movie about train engineers could be so engaging?
To all the jokers, out-there, making over-the-top movies, with terrible writing... take note...
Sincerity, and realism, work better 100% of the time.
This movie has replay value, and it'll be one that I recommend for years to come, for all ages.