Operator of vessel #1 a commercial ferry was in the process of doing a routine turn around when the throttle got stuck on high in reverse and collided with vessel #2 (a docked vessel).  Operator of vessel #1 and two employees were running around the vessel attempting to shut it down while black smoke billowed from the exhaust.  The occupants on vessel #2 were trying to fend off vessel but were advised by responding Officer not to because it was holding the boat in place and could cause further damage to the dock and other vessels.  About two minutes later the engine died out and the vessel ceased moving.  One woman on vessel #2 was injured.  Accident cause was failure of engine throttle.
Boston                        