In addition, the Board notes that although the NLRA and the RLA share several common features, the NLRA was not perfectly modeled after the RLA. See Bhd. of R.R. Trainmen v. Chi. River & Ind. R.R. Co., 353 U.S. 30, 31 n.2 (1957) (“The relationship of labor and management in the railroad industry has developed on a patt