Which term refers to the control concept where movements on a track are authorized by a Form D system outside yard limits?

Which term refers to the control concept where movements on a track are authorized by a Form D system outside yard limits?

• A. Fouling a Track
• B. Engine
• C. Form D Control System (DCS)
• D. Fouling Point

Answer: (C)

Movements outside yard limits are controlled by a written authorization rather than fixed signals. The Form D Control System is the mechanism used to issue that authority. A Form D documents the specific movement, the track segment, direction, equipment, and time window, and it grants permission to proceed on that track while the authority is in effect. This keeps the track protected from other movements while the Form D is active. The other terms describe physical track occupancy or locations rather than the control method: fouling a track refers to occupying a track, fouling point is a specific location, and engine is not related to the control concept.

Movements outside yard limits are controlled by a written authorization rather than fixed signals. The Form D Control System is the mechanism used to issue that authority. A Form D documents the specific movement, the track segment, direction, equipment, and time window, and it grants permission to proceed on that track while the authority is in effect. This keeps the track protected from other movements while the Form D is active. The other terms describe physical track occupancy or locations rather than the control method: fouling a track refers to occupying a track, fouling point is a specific location, and engine is not related to the control concept.