One of my two top picks for this challenge.
The strong subject in the front (locomotive) is the main element that helps to tell everything about the scene you see behind it. Combined with the interesting contrast/ great lighting and wonderful B&W it makes a great pic.
This could be SO nice, but there's alittle too much sky with nothing happening; a full third of the image is empty space. And the critical dark areas, on the shaded sides of the cars, are crying out for a little detail in the shadow. Otherwise the tonalities are rich & palpable.