During the 1960s, the world's shipping companies were in trouble. Their existing break-bulk cargo ships were proving uneconomical to load and unload as labor costs, particularly in developed countries, climbed, and ships spent over half their time sitting still while stevedores emptied and filled their holds. Something better would be needed, presumably a way to package cargo into larger containers which could be moved on and off the vessel relatively easily.

CMA CGM Benjamin Franklin, the largest container ship ever to dock in North America1
This wasn't a completely new idea. In fact, its roots stretched back over a century, to the early train ferries, designed to bridge bodies of water too wide for bridges. Fully-loaded rail cars would be brought aboard on internal tracks and then shuttled across to the other side. Much the same was done during WWII, when LSTs were filled with fully-loaded trucks, which would simply be driven off on the beach at the far end. However, this kind of loading was rather inefficient, with an LST able to carry only a quarter of what it could if loaded with bulk cargo. During the Bismarcks campaign, the sacrifice in cargo was unacceptable, and a compromise was found in the form of loading the LST with trailers, which could carry more cargo than trucks, but still be unloaded quickly. Read more...
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