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66 3.5.10 Other Mass Transit Definitions arranged times at any location within the system's ser- vice area. Also called "Dial-a-Ride." The mass transit definitions listed below are from the Ferry boat: A boat providing fixed-route service across APTA "Glossary of Transit Terminology." a body of water. Heavy Rail: An electric railway with the capacity for a Aerial Tramway: An electric system of aerial cables "heavy volume" of traffic and characterized by exclusive with suspended unpowered passenger vehicles. The ve- rights-of-way, multi-car trains, high speed and rapid ac- hicles are propelled by separate cables attached to the celeration, sophisticated signaling, and high platform vehicle suspension system and powered by engines or loading. Also known as "rapid rail," "subway," "elevated motors at a central location not on board the vehicle. (railway)" or "metropolitan railway (metro)." Automated Guideway: An electric railway operating Inclined Plane: A railway operating over exclusive without operators or other crew on board the vehicle. right-of-way on steep grades with unpowered vehicles Bus (Motorbus): A rubber-tired, self-propelled, manu- propelled by moving cables attached to the vehicles and ally steered vehicle with fuel supply carried on board powered by engines or motors at a central location not the vehicle. Types include advanced design, articulated, on board the vehicle. charter, circulator, double deck, express, feeder, inter- Light Rail: A metropolitan electric railway system that city, medium-size, new look, sightseeing, small, stan- can operate single cars or short trains along exclusive dard-size, subscription, suburban, transit and van. right-of-way at ground level, aerial structures, in sub- Cable Car: An electric railway operating in mixed street ways, or on streets. Passengers are boarded and dis- traffic with unpowered, individually-controlled transit charged at the track or car floor level. vehicles propelled by moving cables located below the Monorail: An electric railway in which a rail car or train street surface and powered by engines or motors at a of cars is suspended from or straddles a guideway central location not on board the vehicle. formed by a single beam or rail. Most monorails are ei- Commuter Rail: Railroad local and regional passenger ther heavy rail or automated guideway systems. train operations between a central city, its suburbs and/or Trolley Bus: An electric, rubber-tired transit vehicle, another central city. It may be either locomotive-hauled manually steered, propelled by a motor drawing current or self-propelled and is characterized by multi-trip tick- through overhead wires from a central power source not ets, specific station-to-station fares, railroad employment on board the vehicle. Also known as "trolley coach" or practices, and usually only one or two stations in the cen- "trackless trolley." tral business district. Also known as "suburban rail." Van Pool: An arrangement in which a group of passen- Demand Response: Non-fixed-route service using vans gers share the use and cost of a van in traveling to and or buses with passengers boarding and alighting at pre- from pre-arranged destinations together.