Which of the following is NOT a component of the Train Control Apparatus?

The Crew communication device is indeed not considered a component of the Train Control Apparatus. The Train Control Apparatus primarily refers to systems and devices that ensure the safe operation and control of trains. This includes automatic train control, which regulates train speed and ensures safe distances between trains, the aspect display unit that visually communicates signals to the train operator, and the automatic train stop system that can intervene to prevent accidents by halting the train under certain conditions.

In contrast, the Crew communication device serves a different purpose. While it is essential for maintaining communication between crew members, such as conductors and engineers, it does not directly influence the control of the train in terms of speed or safety measures related to train operations. Therefore, it stands apart from the primary functions that the other components of the Train Control Apparatus serve.