What apparatus does the RTC use to control switches and signals in CTC territory?

The control console is the primary apparatus that the Rail Traffic Controller (RTC) utilizes to manage switches and signals within Centralized Traffic Control (CTC) territory. This console serves as the interface through which the RTC can monitor train movements, change signal aspects, and control the routing of trains via switches. It allows for enhanced communication and coordination across the rail network and can be used to respond quickly to on-track situations or emergencies by adjusting signals and switches as necessary for safety.

In contrast, the other options do not serve the same functional role. The aspect display unit indicates signal aspects to the train crews, but it does not provide the means to control them. Yard tracks refer to the sections of rail yard where trains are assembled or stored and do not have any operational control capabilities. An alerter is a safety device used within locomotives to ensure that the engineer is attentive and alert but does not control switches or signals.