Piggyback Transport

Piggyback transport carries one mode of freight movement on another, most commonly a highway trailer or semi-trailer loaded onto a railway flatcar for the long haul portion of its journey. The practice traces to horse drawn road coaches carried on flatcars of the Liverpool and Manchester Railway around 1830, and grew into a major American freight category in the twentieth century: trailer on flatcar traffic rose from about one percent of US rail freight in 1957 to five percent by 1964 and fifteen percent by 1986. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/