Those holes are put there during fabrication to install brakes or trims. After testing they were probably removed due to not being needed (or never used in the first place), but that is what they are for. As far as Real's re-creation, as soon as you tell me how to add "holes" to the track in the editor, your argument will be valid.
Hope this helps -- and oh, I got two words for you ...
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Sometimes the best thing to say is nothing at all.