What is the location of the shunt indicator?

The correct choice indicates that the shunt indicator is located on the 22 track in C-Yard. This choice is relevant because it highlights a specific operational area within the transit system where critical functions, such as shunting, occur. The C-Yard is typically a location where trains are stored, repaired, or repositioned, making accurate indicators essential for safety and operational efficiency.

In this context, placing the shunt indicator in C-Yard ensures that train engineers and operators are aware of the shunting activities happening in that area, thereby enhancing communication and safety protocols among personnel working in a busy yard environment. Properly signaling where shunts are occurring helps to prevent accidents and maintain the flow of operations.

Other options, while they may appear plausible, do not align with the specific operational requirements and locations typically designated for shunt indicators. Locations such as the main terminal, inside a facility, or underneath a train would not provide the necessary visibility or timely information regarding shunting, which is crucial in ensuring the safe and effective management of train movements.