monorail

[mon-uh-reyl]
noun
1.
a single rail functioning as a track for wheeled vehicles, as railroad or other cars, balanced upon or suspended from it.
2.
a railroad or other transportation system using such a rail.
3.
a vehicle traveling on such a rail.

Origin:
1895–1900; mono- + rail1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
monorail (ˈmɒnəʊˌreɪl)
 
n
a single-rail railway, often elevated and with suspended cars

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

monorail
1897, coined from mono- + rail (n.1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The overhead monorail took him to the recovery pool.
Maybe a monorail system within interstate highway property with links to park
  and rides throughout the country.
Science mags use to talk about the future of transportation of high speed
  monorail trains and flying cars.
The monorail stop is a draw, too, because it is now easier to get to and from
  here.
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