Which type of indication shows track switch and controllable signal locations?

The correct answer is the model board display because this type of indication is specifically designed to visually represent the status and locations of track switches and controllable signal locations within a signaling system. A model board display provides operators with an overview of the track layout, illustrating not only the position of switches—whether they are in the straight or diverging position—but also the status of signals, which is essential for ensuring safe and efficient train operations.

This visual aid aids operators in maintaining situational awareness of the railroad environment they are managing, allowing for timely and informed decision-making. The model board helps prevent confusion about the operational state of different track segments and signaling effects in real-time.

The other options, while they might signal or convey information regarding train movements and operations, serve different primary purposes. For example, track route indication lights usually show the selected route for a train but do not provide a comprehensive layout or interactive display of switches and signals. Directional displays help indicate which way a train can proceed but do not include detailed layouts of the entire track and switch systems. Operator location lights may indicate where an operator is situated but lack the function of depicting track switch and signal locations. Thus, the model board display is the most suitable choice for showing both track switch and