This is from a scene early in the movie. I wasn't happy with how this scene worked in the assembly edit, so it is being restructured... and rebuilt... with a new bridge. This screenshot was taken while adding damage to the bridge.
Here's another shot from the same scene. This is a train (not our train!) that fell from the bridge. No damage yet. There are 1 billion polygons in this shot. Okay, I exaggerated. Feels like a billion.
A few posts ago I mentioned train pick-up shots. Here is a still from one of those completed shots.