It is a combination of road and water transport. Fishy back/ train
ship/ containership are examples of the oldest mode of the intermodal
transport. They utilize waterways, which are one of the least
expensive methods for line- haul movement. The fishy back, train ship
and container ship concepts load a truck trailer, railcar, or
container on to ship for the line- haul move. Such services are
provided in coastal waters between Atlantic and Gulf ports, from the
great lakes to coastal points and along inland navigable waterways.