Heralding the larger ships cascading into the trans-Pacific trade, the CMA CGM Callisto, the largest container ship ever to call Puget Sound, arrived Tuesday at Terminal 18 in Seattle. With a capacity of 11,400 20-foot equivalent container units (TEUs), the Callisto is 1,193 feet long and 150 feet wide. That is 100 feet longer than the USS Nimitz aircraft carrier. Almost two Space Needles could fit end to end across its length. It holds more than 40 percent more cargo than most of the container ships that call at Northwest Seaport Alliance terminals. Terminal 18 is a 196-acre container terminal on Elliott Bay in Seattle. The marine terminal features 10 cranes, seven of which are super-post-Panamax and three post-Panamax, 50-foot water depth, on-dock and near-dock rail and a berth measuring 4,440 feet. “Ships continue to get larger, and we are ready for them,” said John Wolfe, Northwest Seaport Alliance chief executive officer. “We are investing in our terminals and road and rail infrastructure to handle more cargo and the super-post-Panamax ships moving into the trans-Pacific trade.” CMA CGM, based in Marseille, France, has called in Seattle since 2005. The Callisto, which is repositioning to join the Yangtse Service, called in Vancouver, B.C., before arriving in Seattle. It is scheduled to head Wednesday to Shanghai.