[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR220.31] [Page 256] TITLE 49--TRANSPORTATION CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 220_RAILROAD COMMUNICATIONS--Table of Contents Subpart B_Radio and Wireless Communication Procedures Sec. 220.31 Initiating a radio transmission. Before transmitting by radio, an employee shall: (a) Listen to ensure that the channel on which the employee intends to transmit is not already in use; (b) Identify the employee's station in accordance with the requirements of Sec. 220.27; and (c) Verify that the employee has made radio contact with the person or station with whom the employee intends to communicate by listening for an acknowledgment. If the station acknowledging the employee's transmission fails to identify itself properly, the employee shall require a proper identification before proceeding with the transmission. [[Page 257]]