What is the typical sequence for issuing a new warrant for a moving train?

• A. The crew issues a correction and the dispatcher approves.
• B. Dispatcher confirms clear track status, issues the new warrant with boundaries and time window, and crew acknowledges read-back.
• C. A doctor reviews the warrant.
• D. The train proceeds without a warrant.

Answer: (B)

In moving-warrant control, the safety-critical step is the formal exchange between the dispatcher and the train crew to establish a new authority to occupy or move within a defined path. The dispatcher first verifies that the track is clear for the requested boundaries and time window. If the track is indeed clear, the dispatcher issues a new warrant that specifies the movement boundaries and the time frame during which the train may operate within them. The crew then acknowledges by read-back, confirming they heard and understand the exact boundaries and time window. This read-back verifies mutual understanding and prevents miscommunication about where and when the train is allowed to move.

This sequence—confirm track status, issue the warrant with clear boundaries and a time window, and crew acknowledges read-back—is essential for maintaining safe, coordinated movement between dispatch and operations. It ensures everyone is on the same page before the train proceeds.

The other options don’t fit because:

• The crew issuing a correction and the dispatcher approving reverses the typical flow; dispatch is the authority issuing warrants, and corrections are not the standard sequence for initiating a new moving warrant.

• A doctor reviewing the warrant is not part of rail operations or safety communications.

• Proceeding without a warrant is not permissible and would violate safety rules and operating procedures.