It has alphas, BUT....... not for the part the is the bottom of the bridge which is under the track.
Correct. And for that reason OR sunlight treats the entire matrix as if it is alpha'd out, thus no shadows.
We can sometimes see this same effect with rolling stock. A long freight train will be going by, and some of the cars won't be casting shadows. Those cars likely have their superstructures enabled to alpha out certain details, door openings, etc. Sometimes the shape and/or the texture can be adjusted to fix it, sometimes not.
This issue is most likely to be found in early MSTS models which were very fastidiously created for low poly and minimal textures. The bridges in question are most definitely from that generation.
I am pretty sure that by design, all track shapes do not cast shadows in Open Rails, this includes track shapes that are surrounded by bridges. The only way around this is to copy the shape and not use it as a track shape, by renaming it etc. You will have to lay simple track over that bridge. It is not the best solution as you will have flickering because of Alpha Blend as the camera moves toward or away from the track. There is a better way, but the solution will be frowned upon here by not thinking outside the box.
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