Passenger rail terminology
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Various terms are used for passenger railway lines and equipment; the usage of these terms differs substantially between areas:
Chicago Transit Authority Chicago "L" tracks in the Chicago Loop at the Adams/Wabash station at night
A 2600 series car brings up the rear of a Red Line train (temporarily rerouted through the elevated tracks of the Chicago Loop) at Randolph/Wabash.
Parry People Mover ultra light rail on Stourbridge Town branch line
An interurban tram from the Philadelphia & Western Railroad, which survived long in the interurban business
Monorail
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A monorail is a form of urban rail transit in which trains run on or are suspended from a single rail or beam. Monorails typically provide intermediate transport capacity, generally greater than trams
Monorail on concrete columns in Chongqing, China
Gyroscopically balanced monorail (1909) by Brennan and Scherl
"Popular Science" February 1934, p. 41: "A new Russian type of monorail that runs in a chute on large spheres."
Seattle Monorail, built in 1962 and still using the original ALWEG trains