A train authorized by Form D line 2 to operate in both directions has exclusive occupancy of the track, and may operate in either direction. The Dispatcher must not authorize other movements within the line 2 limits. The line 2 authority remains in effect until?

• A. Cancelled
• B. Fulfilled
• C. Extended
• D. Expired

Answer: (A)

A Form D line 2 gives a train exclusive occupancy of a track or block and allows movement in either direction within those limits. The crucial point is that this authority continues to be in effect only as long as the dispatcher maintains it by canceling it when it’s no longer needed. There’s no automatic expiration or fulfillment that ends the authority; it ends only when the dispatcher cancels it (or issues a new authority that overrides it). That’s why the correct choice is that the line 2 authority remains in effect until canceled.