Good question, system seemed to feel like air off/spring applied ie reduce line to let springs apply brakes. Stops always seemed smooth, couldn't
tell much difference from a standard air system. My first employer did a major amount of hydraulic and pneumatic work at the park, in fact we were
Disney's preferred supplier. I was down there three times on some service and installation work and never could get near the trains. You were given
an escort to the area where the work was performed and had no chance to wander.