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The Association of American Railroads (AAR) has assigned the IMRL with the following radio frequencies for use in their railroad operations. Train crews will use these frequencies when operating between the locations listed below. IMRL trains operating on foreign railroads will use the radio frequencies assigned to that particular railroad.

Most modern day locomotives are equipped with 97 channel, synthesized radios. This gives train crews access to another railroad's radio frequencies which allows for smoother operations. These 97 channels are designated by the AAR from the frequencies allocated for railroad use in the United States and Canada.