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Public transportation

67 bytes added, 20:11, 24 April 2013
Heavy rail
===Heavy rail===
[[File:Subway U3 Berlin Heidelberger Platz.jpg|right|thumb|300px]]
Many large urban areas have heavy rail systems. Often referred to as "subway," "metro," or similar, these trains operate on a closed off track that could be above, below, or at grade level, varying depending on the part of the route. 

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