Section 2, Eighth, of the Railway Labor Act provides that every carrier shall notify its employees by printed notices in such form and posted at such times and places as shall be specified by order of the Mediation Board and requires that all disputes between a carrier and its employees will be handled in accordance with the requirements of the act. In such notices there must be printed verbatim, in large type, the third, fourth, and fifth paragraphs of said section 2, Eighth, of the Railway Labor Act.

The provisions of the third, fourth, and fifth paragraphs of section 2 are by law made a part of the contract of employment between the carrier and each employee and shall be binding upon the parties regardless of any other express or implied agreements between them. Under these provisions the employees are guaranteed the right to organize without interference of management, the right to determine who shall represent them, and the right to bargain collectively through such representatives. This section makes it unlawful for any carrier to require any person seeking employment to sign any contract promising to join or not to join a labor organization. Violation of the foregoing provisions is a misdemeanor under the law and subjects the offender to punishment.

General Order No. 1, issued August 14, 1934, is the only order the Board has issued since its creation in 1934. This order sent to the President of each carrier coming under the act transmitted a sample copy of the Mediation Board's Form MB-1 known as “Notice in re: Railway Labor Act.” The order prescribes that such notices are to be standard as to contents, dimensions of sheet, and size of type and that they shall be posted promptly and maintained continuously in readable condition on all the usual and customary bulletin boards giving information to employees and at such other places as may be necessary to make them accessible to all employees. Such notices must not be hidden by other papers or otherwise obscured from view.

The only substantive rules issued by the National Mediation Board are those authorized under section 2, Ninth, of the Railway Labor Act to implement the procedure of determining employee representation.