What is the primary purpose of a PTC system?

The primary purpose of a Positive Train Control (PTC) system is indeed to ensure safe movement of trains by monitoring and managing aspects such as speed and braking. PTC technology is designed to prevent accidents caused by human error, including collisions, derailments, and over-speed incidents. It accomplishes this by automatically intervening if a train is traveling too fast or in ways that could lead to unsafe situations, ensuring that train operations remain within established safety parameters.

By focusing on the relationship between speed and braking, PTC systems enhance the overall safety of the rail network. This allows for safer operations, not just for train crews and passengers, but also for roadway workers who might be present in or near the track area. It is an essential component of modern rail safety strategies. Other choices do not encompass the core functionality of a PTC system, making them less relevant as answers to this specific question about its primary purpose.