Add a research option to increase the maximum distance between rail supports

Sometimes, I want to make railway junctions with elevated segments, but I can't fit certain curve radii underneath them. Or, I want to run tracks over parts of the factory. And I can almost do what I want to do, but supports can't be separated enough to do what I want.
How about adding a non-repeating tech that appears a few times along the tech tree that increases the amount of track any given support can hold up, allowing you to over time build longer spans of elevated tracks, which can also enable more sophisticated interchanges and junctions.

There are bridges and level 2 trains in UPDATE 4, i would not be surprised that there would be some more advanced rails (there will be at least the electric ones) or even advanced rail support (but costing some resources).