What is a distinguishing feature of extended range dynamic brakes compared to basic range dynamic brakes?

Extended range dynamic brakes have the capability to maintain effective retarding force down to a lower speed, specifically 6 mph, before experiencing a fade in performance. This characteristic is critical for train operations as it allows for more effective braking in situations where reduced speed control is necessary, such as during approaches to stations or when negotiating curves. The design of extended range dynamic brakes enables them to provide consistent braking performance even at lower speeds compared to basic range dynamic brakes, which may begin to lose effectiveness at higher speeds and do not perform as well at lower speeds. This feature enhances overall safety and control, making extended range dynamic brakes particularly advantageous in various operational contexts.