There was a combination I would use for RR Tracks in FS9,.. Ultimate Terrain for the base + an extracted RR texture from another addon that put rail cars on the tracks!! It looked perfect from 1500ft and up, just like a busy railway.
It does not work in FSX because they completely changed the RR texture file
I suspect as time goes on and SP1 gets released, so will the upgrades to the scenery and things like railroads.