What is the purpose of the J-Relay in a train's braking system?

The J-Relay plays a crucial role in a train's braking system by receiving signals from the control valve. This function is essential for the proper operation of the air brake system. When the locomotive engineer applies the brakes by manipulating the control valve, the J-Relay processes these signals and facilitates the appropriate response throughout the train’s braking system.

Understanding this mechanism is critical for safe train operations. The ability of the J-Relay to accurately transmit brake commands ensures that braking actions are timely and effective across all cars in the train. This coordination helps maintain stability and control during braking, which is vital for both the safety of the crew and the integrity of the cargo being transported.

By focusing on this important function, personnel can better appreciate how signals from the control valve translate into effective braking actions, ensuring smoother and safer train operations.