Here is a very rough quick 5 minute idea of a Train Version two. You think they might upgrade from those old clunkers flying around.. I dunno. Here's the idea, I'm not really sure where to go from here so I'm open to suggestions.. thanks.
My opinion is to go by the concept of the old train. IE: A "locomotive" dragging the cargo behind it, that's what made the train the train if you know what i mean.
advice...don't use filleted surfaces, they create too many unnecessary polygons and can be nightmare to texture, smooth ships don't look FL-ish, and nicely made chamfer in game looks smooth enough.