SAN DIEGO, Jan. 28, 2013 /PRNewswire/ — General Dynamics NASSCO, a wholly owned subsidiary of General Dynamics (NYSE: GD), announced today that it has finalized a contract with Totem Ocean Trailer Express to design the conversion of the company’s two existing Orca Class, diesel-electric trailerships to liquefied natural gas (LNG) propulsion. This design contract is in addition to the new-construction order that TOTE Shipholdings placed with NASSCO last month for the construction of two new LNG-powered containerships.