...reasonable time, or when the appropriate adjustment board has not been organized under § 302, the Railroad Labor Board, "(1) upon the application of the chief...executive of any carrier or organization of employees or subordinate officials directly interested in the dispute, (2) upon a written petition signed by...

...title is authorized to hear and decide such dispute." Section 303: "Each such Adjustment Board shall (1) upon the application of the chief . executive of any carrier or organization of employes or subordinate officials whose members are directly interested in the dispute, (2) upon the...

...Section 304 provides that a dispute may be brought before the Adjustment Board in one of three ways: (1) Upon the application of the chief executive of any carrier or union involved in the dispute ; (2) on the written request of any three members of the Adjustment Board,...