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You're missing the textures for Railcraft. I personally haven't been able to find any that have been updated in the last few years, or even ones that work with RR3, but I use the ones included in the old version of Griff's patch (https://griffsden.com/minecraft/griffs-s ... nant-rise/) which were for the Yogscast Complete pack.
These work, but don't cover all the electrical train parts or tracks, and don't work for the locking track (even though the textures for the locking track are in there and named the same as in the config, and the locking track is really just a bunch of old tracks merged together in one - not sure what the file names should be for that one to make it work).
Not sure what the source for Griff's textures is, but it doesn't appear to be available on these forums anymore. The 6.10+ patch for Railcraft that "someone" posted elsewhere doesn't work with RR3 - different file/folder structure.