Containers.
A seaport container terminal stores large containers that are eventually loaded on seagoing ships
for transport abroad. Containers coming to the terminal by road and rail are stacked at the
terminal as they arrive.
Seagoing ships carry large numbers of containers. The time to load a ship depends in part on the
locations of its containers. The loading time increases when the containers are not on the top of
the stacks, but can be fetched only after removing other containers that are on top of them.