[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: 49CFR220.35] [Page 257] 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. 220.35 Ending a radio transmission. (a) Except for transmissions relating to yard switching operations, at the close of each transmission to which a response is expected, the transmitting employee shall say ``over'' to indicate to the receiving employee that the transmission is ended. (b) Except for transmissions relating to yard switching operations, at the close of each transmission to which no response is expected, the transmitting employee shall state the employee's identification followed by the word ``out'' to indicate to the receiving employee that the exchange of transmissions is complete.