How is a track warrant activated or made effective for a train crew?

• A. The crew activates it by turning a key on the locomotive.
• B. The warrant automatically becomes effective at sunrise.
• C. The crew must file a form with the yardmaster.
• D. The train crew receives the warrant information from the dispatcher and begins operating within the stated limits once the warrant is read back and acknowledged, or when the authority is in effect per procedure.

Answer: (D)

Track warrants are dispatching authority granted to a train crew to move within predefined limits. The dispatcher provides the warrant information to the crew, usually over the radio, detailing the limits, any speed restrictions, and the conditions of authority. The crew then performs a read-back to confirm they have captured the exact limits and details. The warrant becomes effective once the read-back is acknowledged by the dispatcher, or when the authority is in effect according to the respective procedure. This process ensures clear, verifiable communication and prevents conflicts with other movements. Activation by a key, automatic activation at sunrise, or filing a form with a yardmaster do not reflect how warrants are issued and made operative.