RedactedNarrative: The operator of a vessel 1 and operator of vessel 2 weres assisting a disabled vessel under the railroad bridge. The operator of vessel says he did not see vessel 2 in front of him after vessels 2's turn he was only 3-4ft away. Operator of vessel 1 struck vessel 2 at midships and the momentum of the vessel 2 carried the 2 boats up against the bridge abutment.  No injuries.