What is required of the lead controlling locomotive for dynamic brakes to function properly?

For dynamic brakes to function effectively, the lead controlling locomotive plays a critical role, and all the listed requirements contribute to this functionality.

Having an operative accelerometer is essential, as it measures the train's acceleration and provides critical data to ensure that the dynamic braking process is responsive and accurate. If it is non-functional, it could compromise the system’s ability to apply the correct amount of braking force.

Additionally, the lead locomotive must have an operative dynamic brake. This is fundamental because the dynamic braking system relies on the lead locomotive's ability to create a braking force that can decelerate the entire train. A functional dynamic brake is the cornerstone of this braking method, as it utilizes the locomotive's traction motors to dissipate energy and slow down the train.

Moreover, the lead controlling locomotive must be capable of controlling the dynamic brakes of the trailing locomotives. This means that the command signals from the lead unit need to effectively manage the dynamic braking functions of any additional locomotives in the consist. Coordination among multiple units is necessary for effective braking, preventing uneven wear and ensuring safety during deceleration.

Thus, all these components are interconnected, and for dynamic brakes to operate properly, all of these requirements must be met.