Which of the following systems enhances braking performance in trains?

The dynamic braking system enhances braking performance in trains by using the train's own traction motors to slow down the train. In this system, when the driver activates the brakes, the traction motors switch roles and operate as generators. This process converts the kinetic energy of the train into electrical energy, which is then dissipated as heat through resistors. This method helps in reducing the wear and tear on the traditional friction brakes, allowing for smoother and more efficient deceleration especially in situations where continuous braking is necessary.

Dynamic braking is particularly effective for heavy trains and during long descents, making it a critical component in modern train operations where safety and equipment longevity are paramount. Comparatively, while other systems like pneumatic braking and hydraulic suspension play important roles in train operation and stability, they do not fundamentally improve braking performance in the same dynamic and regenerative manner as dynamic braking does.