Public transport, public transportation, public transit or mass transit comprise all
transport systems in which the passengers do not travel in their own vehicles. While the above terms are generally taken to include
rail and
bus services, wider definitions might include scheduled
airline services,
ferries,
taxicab services etc. — any system that transports members of the general public. A further restriction that is sometimes applied is that transit should occur in continuously shared vehicles, which would exclude taxis that are not shared-ride taxis.
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A rapid transit, underground, subway, elevated or metro(politan) system is a
railway — usually in an
urban area—with a high capacity and frequency of service and
grade separation from other traffic. In most of the world, these systems are known as a "Metro." In
London, the system is called the "Underground," in
Buenos Aires "
Subte," and in most of
North America and in
Glasgow,
Scotland, "subway." The oldest rapid transit system in the world is the
London Underground, which opened in
1863.
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