In Brotherhood of Railroad Trainmen v. Jacksonville Terminal Co., 394 U.S. 369, 378, 89 S.Ct. 1109, 1115, 22 L.Ed.2d 344 (1969), the Court emphasized: "Nowhere does the text of the Railway Labor Act specify what is to take place once these procedures have been exhausted without yielding resolution of the dispute. Implicit in the statutory scheme, however, is the ultimate right of the disputants to resort to self-help-'the inevitable alternative in a statutory scheme which deliberately denies the final power to compel arbitration.' We have consistently so held in a long line of decisions. " 394 U.S. at 378, 89 S.Ct. at 1115.