| In American terms, a "subway" is simply heavy-rail mass transit, whether it be above ground, at grade, or underground. The New York City Subway, Baltimore's Metro Subway, and the Toronto Subway are systems named "subway," but are not totally underground. In most other cities these systems are called "metros," as they are simply metropolitan railways no matter where they are located, like the Paris or Miami metros (London being an exception, drawing a distinction between Underground and Overground). Simply change the title to "electrified underground urban railways" if you don't want to count above ground systems and don't want to acknowledge, for example, the Brooklyn Els that were electrified starting in 1893 and form the oldest part of the New York City Subway. |