Under what condition can a dispatcher authorize movement against traffic without a Form D line 2?

A dispatcher can authorize movement against traffic without a Form D line 2 specifically when the train is one train length beyond a home signal for a shifting move. This situation typically indicates that the train is already past the point of no return from a safety standpoint and is engaged in a maneuver that has been assessed as safe under the specific circumstances, such as shifting operations.

In railroad operations, the authorization against traffic without a Form D line 2 emphasizes the flexibility that can be exercised during specific operational situations when safety protocols are still maintained. This option reflects the understanding that certain contexts, such as being in close proximity to a home signal while already making a move, allow for a carefully controlled and monitored adjustment in movement.

The other scenarios provided do not convey sufficient control or safety assurance that is necessary for authorizing movements against traffic. For example, having all signals green or conducting a train inspection does not inherently justify moving against traffic. Crews being prepared is important, but it does not replace the necessary operational protocols that govern the movement of trains, particularly in regards to signaling and authorizations.