RedactedNarrative: The 52 foot sailboat Shenanigans, was traveling from home port of Sag Harbor, NY to Solomon Island, MD with a crew of six on board.  They had left on Thursday from NY.  (Different information from the float plan provided.)They entered the Chesapeake and Delaware Canal from the east.  The operator had come on shift at approximately 0300 hours.  He was operating the sailboat without the aid of navigation devices, operating by sight only.  The crew below deck had electronic navigational devices accessible to them.  The operator stated he has transited the CandD Canal at least eight times before.  He stated he could see the navigational lights on the railroad bridge.  He stated that he had good night visibility and lighting from the sailboat lights and canal lights.  He stated the mast struck the center of the railroad bridge.  The sailboat was traveling at about 8 knots with the westerly current.  He stated the mast hit the bridge about 10 to 12 feet from the top of the masthead.  The mast snapped and the fell rigging came down around him.  He was struck by unknown objects causing a large laceration to the back of his left hand requiring eight stitches.  He was also hit in the right temple area of the head requiring four staples.  He remained alert, the crew piloted and docked the sailboat in Chesapeake City, MD.