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APPENDIX F (b) An employee shall acknowledge receipt of all transmissions directed to him or his station

(c) An employee who receives a tansmission shall repeat it to the transmitting party unless the communication:

(1) Relates to yard switching operations:

(2) Is a recorded message iron: an automatic alarm device, or

(3) Is general in nature and does not contain any Information, Instruction or advice which could affect the sanity of a railroad operation.

§ 220.35 Ending a transmission.

(a) 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) At the close oi each trabsmission to which no response is expected, the transmitting employee shall state his identification followed by the word "out" to indicate to the receiving employee that the exchange oi transmissions is complete.

§ 2211.37 Voice test.

(a) Each radio which is used in connection with a railroad operation outside yard 11mits shall be tested at the point where the train is originally made up At least once during each tour of duty. the engineer and conductor shall be responsible for the testing of the radio to verify that the radio is operating properly on the engine and caboose. The tests shall consist of an exchange of voice transmissions with another station. The other station shall advise the station conducting the test of the quality and readability of its transmission.

(b) Any radio found not to be functioning properly shall be removed from service until it has been repaired.

(c) When a radio is removed from service, each crew member of the train and the train dispatcher or other employee designated by the railroad shall be so notified.

§ 220.39 Continuous monitoring

Engine and caboose radios must be turned on to the appropriate channel as designated in $220.23 with the volume adjusted to receive communications while the engine or caboose is manned.

§220.41 Notification on failure of tail! radio.

The failure of an engine or caboose radio on route shall be reported as soon as practicable to the train dispatcher or other employee designated by the railroad by any alternate means of communication available

§220.43 Communication consistent with rules.

Radio communication may not be used in connection with a railroad operation in a manner which conflicts with the requirements of this Part 220. Federal Communication Commission regulations or the rallroad's operating rules. The use of citizen band radios for railroad operating purposes is prohibited.

§220.45 Communication must be complete.

Any radio communication which is not fully understood or completed in accordance with the requirements of Part 220 and the operating rules of the railroad, shall not he acted upon and shall he treated as though not sent.

§ 220.47 Emergencies.

(a) An emergency transmission shall be preceded by the word "emergency", repeated three times. An emergency transmission shall have priority over all other transmissions and the frequency or channel shall be kept clear.