The answer is this year's new class container ship called the Triple E. It goes into service this month.
Each ship will have the a capacity equivalent to 18,000 20-foot containers (TEU).
To put it in perspective, they would fill more than 30 trains, each a mile long and stacked two containers high.
When you get bigger ships, you can more efficiently carry more cargo, so the fuel footprint you get per tonne of cargo is smaller. The Triple E is the most environmentally friendly container ship yet. (The three Es in the name stand for economy of scale, energy efficiency and environmentally improved.)
It seems as though a lot of capital is being directed at the Panama Canal expansion project. Eastern RRs are investing in their infrastructure, awaiting increased business for both imports and exports transportation. Eastern Coast ports/cities/states are investing billions to be ready, it means a lot in revenues and jobs for them. Panama is investing billions to get increased traffic and fees. Ship builders are investing to take advantage of the larger canal.
There are a lot of believers in what will occur over the next couple of years. A lot of money is being invested, preparing for increased revenue for all concerned. The only losers will be the Pacific Coast ports.