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Title 49: Transportation
Subtitle B: Other Regulations Relating to Transportation (Continued)
CHAPTER II: FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
PART 220: RAILROAD COMMUNICATIONS
Subpart B: Radio and Wireless Communication Procedures
220.51 - Radio communications and signal indications.
(a) No information may be given by radio to a train or engine crew about the position or aspect displayed by a fixed signal. However, a radio may be used by a train crew member to communicate information about the position or aspect displayed by a fixed signal to other members of the same crew.
(b) Except as provided in the railroad's operating rules, radio communication shall not be used to convey instructions which would have the effect of overriding the indication of a fixed signal.
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