My understanding is that the penalties listed in two DIFFERENT Damage Tracks are cumulative, so that a ship at D on both Sensors and Propulsion would suffer a -2 to Initiative. But are the penalties listed on a SINGLE Damage Track cumulative? So that when a ship with no other damaged systems goes from C to B on the Propulsion Track, does its initiative penalty go from -1 to -3 because the penalties are cumulative or does it go from -1 to -2 because they are not?