It's an antiquated law that has little to no application in today's society, and it needs to go. It was enacted when 95% of the goods, materials, and people moved within the interior of the country we're moved by rail and on only a handful of railroads. That is no longer the case. Protection of the essential transport of mail, troops, and equipment required by the gov't (which was the purpose for which it was enacted) can be easily accommodated through several modes of transportation and a tremendous number of competing companies within each mode.
Therefore, there is no longer any need for the RLA as its become nothing more than a stinking, rotten old piece of legislative decomposition that management in some companies use to unfairly inhibit or thwart collective bargaining efforts.