During the zoo's early decades, a narrow-gauge railroad existed, which carried guests around the outer perimeter of the park from the North Gate to the old seven seas dolphin habitat on the park's south end. Bison lived on a small prairie on the west end of the park and could only been seen from the train, reminiscent of the Old West. The railroad was dismantled in the mid-1980s, although the pathways once used by the train still exist as roads for service vehicles, as does the North Gate station (since converted into a snack stand)