What does PC stand for in PC switch?

The term "PC" in PC switch stands for Power Control. A PC switch is a critical component in the control systems of trains, specifically related to the functioning of the air brake system. Its primary role is to manage and regulate the electrical power that is required for the operation of various systems on the train, ensuring that they function correctly and efficiently.

In the context of train handling, effective power control is pivotal for maintaining safety and performance, particularly during braking and acceleration. This component helps ensure that the train can respond promptly to the engineer’s commands while maintaining stable and safe operations, especially under varying conditions. Understanding the role of power control helps train crews manage their operations effectively, ensuring a responsive and well-functioning train.