What is the role of a controller in mainline operations?

The role of a controller in mainline operations involves having the authority to oversee and manage the flow of operations on the mainline, ensuring that all activities are conducted safely and effectively. This position typically requires a deep understanding of operational protocols, safety regulations, and the coordination of resources to maintain operational efficiency. The controller plays a critical part in decision-making processes, particularly regarding the scheduling and dispatch of trains, handling emergencies, and resolving conflicts that may arise during mainline operations.

In contrast, the other options describe roles that do not align with the specific responsibilities of mainline operations. Training new employees focuses on workforce development, while a project manager handles construction tasks by overseeing project planning and execution. Managing customer service complaints is directed more toward customer relations, which is not part of the mainline operation's immediate concerns. Each of these roles, while essential in their respective areas, does not pertain to the authority and oversight required of a controller in mainline operational settings.