What is the primary method used to issue, modify, extend, or cancel track warrants and to confirm receipt and understanding by the train crew?

• A. Radio communication
• B. Written dispatch forms
• C. Visual signals
• D. Phone calls

Answer: (A)

Radio communication is used because track warrants require timely, two-way verbal instructions between the dispatcher and the train crew. The dispatcher issues, modifies, extends, or cancels a warrant over the radio, and the crew confirms receipt and understanding by repeating the details back. This read-back ensures everyone is on the same page and provides an immediate, verifiable acknowledgment that the authority has been received and understood, which is crucial for safe movement on non-signalled tracks. Written dispatch forms are useful for records but aren’t the real-time method for issuing warrants. Visual signals relate to signaling infrastructure, not to issuing warrants. Phone calls can occur, but they don’t offer the same immediacy and standardization as radio.