Is there a difference in dynamic braking capabilities between the SD-40 and SD-60 locomotives?

The SD-60 locomotive is designed with improvements that allow for greater retarding force in dynamic braking compared to the SD-40. This enhanced capability is primarily due to advancements in the electrical and braking systems, along with differences in locomotive weight and power. The SD-60 typically features a more modern design and better technology, which translates into improved performance in dynamic braking situations.

Dynamic braking systems rely on the use of traction motors to slow the locomotive by converting kinetic energy into electrical energy, which is then dissipated as heat. The more effective the system, the more control and stopping power a locomotive can exert during braking events. Therefore, the SD-60, having been engineered with these enhancements, will generally provide stronger dynamic braking capabilities than the SD-40, making it a better option in scenarios requiring effective retardation and control.