The Quincy (Mass.) shipbuilding division of General Dynamics Corporation has received a $61-million contract from Sun Ship Inc., Chester, Pa., to construct a roll-on/roll-off (RO/RO) ship for Waterman Steamship Corporation of New York City. Sun had originally contracted with Waterman and the Maritime Administration for construction of three RO/ROs.

Other newbuilding contracts at the Massachusetts yard include a $60-million, coal-fired bulk coal carrier for New England Electric, and three oceangoing tank barges for Coastwise Shipping.

Winding down its new ship construction operations, Sun Ship recently contracted with Bath Iron Works in Bath, Maine, for construction of a $65-million dredge for the U.S. Army Corps of Engineers, and a $25-million bulk sugar barge for California & Hawaii Sugar Company. Sun's newbuilding orderbook now contains one products tanker for Sun Transport, and two additional RO/RO ships for Waterman.