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I'm hoping you made the doors as separate animated meshes?
Right now the M8 is just a scenery item. I have no knowledge on animated meshes. For now, I'm only working on turning this into a piece of rolling stock/locomotive.
Still, trying to help you but have not gotten my reply yet
So, I take it the doors are part of the mesh. What I would recommend you do is isolate the polys associated with the doors and save them as a separate mesh for each side, and attach them to the parent mesh via the attachment points a.doors0 and a.doors1. That way, you can add an anim.kin to the doors so that when the train pulls into a passenger-enabled station, the doors will open.
And if you're going to model those nerves yourself, don't do it in Sketchup without putting it in Blender or another modelling program to reduce polys before releasing it.