Which supply chain innovation dramatically reduced loading/unloading time for freight trains and is credited with revolutionizing intermodal transportation?

The modern transportation industry relies heavily on efficient supply chain management to keep goods moving across the country. Rail transportation has undergone significant transformations to maintain its competitiveness against trucking and shipping alternatives. Test your knowledge about an interesting supply chain innovation in the railway freight industry that has revolutionized how goods move across continents.

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Double-stack rail transport
Automated train coupling systems
Positive Train Control (PTC)
Rolling highway technology