Newcastle. At this particular terminal, the stockyard has four pads, $A$, $B$, $C$, and $D$, on which cargoes are assembled. Coal arrives at the terminal by train. Upon arrival at the terminal, a train dumps its contents at one of three dump stations. The coal is then transported on a conveyor to one of the pads where it is added to a stockpile by a stacker. There are six stackers, two that serve pad $A$, two that serve pad $B$ and pad $C$, and two that serve pad $D$. A single stockpile is built from several train loads over several days. After a stockpile is completely built, it dwells on its pad for some time (perhaps several days) until the vessel onto which it is to be loaded is available at one of the berths. A stockpile is reclaimed using a bucket-wheel reclaimer and the coal transferred to the berth on a conveyor. The coal is then loaded onto the vessel by a shiploader. There are four reclaimers, two that serve pad $A$ and pad $B$ and two that serve pad $C$ and pad $D$. Both stackers and reclaimers travel on rails at the side of a pad. Stackers and 