Toronto Zoo Domain Ride

The Toronto Zoo Domain Ride was an automated guideway transit service used to carry visitors between sections, or "domains", of the Toronto Zoo. Though technologically closer to a simple rubber-tired metro, it was almost universally referred to as a "monorail".

The train began running in 1976, and closed in 1994, after a train lost power and rolled backwards down the track into a second train, injuring about 30 people. Parts of the line were subsequently taken over by the Zoomobile, an open-air tractor-drawn vehicle with five stations which had been operating since 1980.

Source: Wikipedia