A block system, signaled or non-signaled, in which the movements of trains outside of the yard limits is authorized by Form D.

A block system, signaled or non-signaled, in which the movements of trains outside of the yard limits is authorized by Form D.

• A. Foul Time
• B. Form D Control System (DCS)
• C. Engine
• D. Extra Train

Answer: (B)

Form D Control System is the method used to authorize movements outside yard limits in a block system, whether signals exist or not. A Form D dispatch order is issued by the yardmaster or dispatcher and carried by the crew to authorize proceeding over the blocks beyond yard limits. It provides the official authority to move and specifies the limits and any conditions, so trains can operate safely even in non-signaled or mixed-signaled territory. Foul Time deals with occupancy time in a block and does not grant movement outside yard limits, while an engine or an extra train are just equipment or train types, not the system that authorizes such movements.

Form D Control System is the method used to authorize movements outside yard limits in a block system, whether signals exist or not. A Form D dispatch order is issued by the yardmaster or dispatcher and carried by the crew to authorize proceeding over the blocks beyond yard limits. It provides the official authority to move and specifies the limits and any conditions, so trains can operate safely even in non-signaled or mixed-signaled territory. Foul Time deals with occupancy time in a block and does not grant movement outside yard limits, while an engine or an extra train are just equipment or train types, not the system that authorizes such movements.