RedactedNarrative: While attempting to navigate east through the Brielle Rail Bridge, operator #1 engaged the throttle to make way.  While doing so the Todd Holmes Chair he was sitting in broke free from the deck, causing the operator to fall backwards to the deck.  While falling backwards, the operator reached for the throttle and pushed it forward, thus causing the vessel to speed up.  At this time victim #2 attempted to take control of the helm, however fell to the deck injuring her head.  Vessel #1 continued through the rail bridge towards the inlet unmanned.  As the vessel cleared the bridge, it began to alter course and steer hard to the starboard side, and head west back towards the rail bridge.  It was at this time the vessel ran hard aground onto the shoreline of Gull Island.  Brielle PD, Fish and Game, USCG, Towboat, Brielle FAS all on scene.  Both occupants sustained contusions from impact with the boat when it ran aground.