Blue signals are used to protect workers who are on, under, or between equipment. A blue flag, blue light, or blue tag indicates that personnel are in or around the equipment, so movement of the train or the equipment itself is restricted until the protection is removed or authorized. This protects workers in the area and is different from track occupancy signals (which indicate the track is occupied), bulletin orders (written directives), or cab signals (onboard speed/authority indications).

Division Notices are informational communications issued by the designated officer that do not affect how trains move. They serve to convey reminders, policy updates, or procedural notes without changing train operations. The publication described as being issued periodically by the designated officer and containing information that does not affect movement fits this definition exactly. It’s not about altering speeds, tracks, or routes, but about sharing information that does not change how trains operate. The other scenarios describe actions that would change train movement—speed limits division-wide, immediate track work, or changes to timetable routes—so they aren’t Division Notices.

Form D handles protection and authorization when a train is disabled in Rule 261 territory. When an opposing movement must be allowed, the instruction on Form D that must be issued to the disabled train is the line that explicitly authorizes that opposing movement while keeping the required protections in place. This is the specific instruction the crews rely on to coordinate movements safely under Rule 261. The other lines on Form D carry different instructions or conditions and do not satisfy the need to authorize an opposing movement in this situation.

When a crew is relieved, any active orders or instructions must be handed over to the next crew. Form D’s and instructions that haven’t been fulfilled or canceled still carry authority, so the relieving conductor or engineer must receive them to know the current directives, restrictions, and any open actions. If they were left with the previous crew, the new crew wouldn’t have the necessary information to operate safely and in compliance, which could lead to violations or unsafe conditions. Filing them with a manifest wouldn’t make them accessible to the new crew, and canceling them when they’re not actually fulfilled would remove valid instructions prematurely. So the correct action is to deliver all unreached or still-in-effect Form D’s and instructions to the relieving conductor or engineer.