This report documents the results of a study of railroad voice communications from three large (Class I) freight railroad dispatch centers. The purpose of the research was to gain an understanding of the types of information that are exchanged between railroad personnel and to determine the types of communication errors that occur between communicating parties. Voice communications from signal, dark, and mixed territories were analyzed with respect to the parties to communications, message content, and the errors that took place. Within the current study, 79 percent (n = 3930) of the transactions contained at least one error. Ninety-five percent of all errors went undetected. Of the 5 percent of errors that were caught and corrected, 55 percent were catching and correcting another’s error. The remaining 45 percent corrected their own error. If radio communication continues to be part of the communication relay in the railroad system, enhanced training for all railroad employees in procedures in communication could be a great benefit. Training that is established and standardized throughout the railroad culture has the potential to lessen the errors that occur during radio communication.